Frequently Asked Questions

General Information

How can I find out who my local dealer is?
Tempest has a separate dealer network for each industry: Firefighting/Rescue, Industrial/Commercial/Rental, and Hot Air Ballooning. For firefighting and rescue, you can search for dealers geographically with our Dealer Locator. Otherwise, contact Tempest Customer Service at, 800.346.2143 or +1 559.277.7577 for the dealer nearest your area or email for assistance with order placement or for additional product information.

How can I arrange a demonstration of a Tempest product?
Contact your local dealer to arrange a demonstration. You can also arrange a demonstration with a factory sales representative or one of our independent manufacturer’s representatives. This can be arranged through Tempest Customer Service.

What is the warranty on your products?
Tempest Fire Power Blowers: 5 years
Tempest Industrial Use Blowers: 1 year
Honda, and Briggs engines: 2 years
Electric Motors and components (incl. drives): 1 year
Smoke Machines: Up to 1 year
VentMaster Fire & Rescue Saw: 1 year 180 days
Consult Tempest product catalog for specific warranty information.

How do Positive Pressure Ventilation (PPV) and Positive Pressure Attack (PPA) work?
There is a complete explanation of Positive Pressure Ventilation principles and applications on our web site. Go to the main page and click on the link that says “About PPV/PPA”. Additional Information on the tactic can be found on our Resources Library page.

What is the difference between Positive Pressure Ventilation and Negative Pressure Ventilation?
PPV gives you complete control over where the exhaust air travels by choosing the exhaust opening. With Positive Pressure Ventilation, you blow into the structure and literally “pressurize” the entire structure. This gives you the ability to ventilate the entire structure of dust particles, heat, gas, smoke or any other type particulate temporarily suspended in the air.

In Negative Pressure Ventilation, a suction fan is placed in a doorway or window “pulling” the air outward. This is called ejection and is a very inefficient method of ventilation because the blower is only able to remove air that is in its general vicinity.

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Pricing and Delivery

How can I find out the price of a particular product?
List prices are available on our published price list. Contact your local dealer for specific quotes that can include all shipping and handling charges. You can receive a copy via fax, email, or mail by contacting Tempest Customer Service at 800.346.2143, +1 559.277.7577 or

How can I find out the price of spare parts, and replacement parts?
Parts prices are also available on our published parts price list. You can receive a copy via fax, email, or mail by contacting Tempest Customer Service at 800.346.2143, +1 559.277.7577 or

How quickly can my order be shipped?
Our typical lead time is from three days (stocked items) to three weeks (built to order items). An expected delivery date can be given when you place your order. Large orders and special requests may take longer.

How can I find out if my order has been shipped?
You can find out the status of your order by calling your local dealer if the order was placed with them, or contact Tempest Customer Service at 800.346.2143, +1 559.277.7577 or

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Tempest POWER Blowers

How do I determine which blower model I have?
On each Tempest blower engine is a decal displaying the serial number and model designation of that blower. For example:

Belt-Drive blower model numbers begin with BD. A BD-18-H-4.8 references a belt-drive eighteen-inch with a Honda 4.8 HP engine.
Direct-Drive blower model numbers begin with DD. A DD-21-H-5.5 references a direct-drive, twenty-one inch with a Honda 5.5 HP engine.
Single Speed Electric blower model numbers begin with SS or EB. An EB-24 references an electric twenty-four inch blower.
The first Tempest blowers produced in the late 1980’s were called “TGB’s” followed by three numbers, such as TGB 214, which indicates a 21 inch four cycle Tecumseh 5hp engine; TGB 244, indicating a 24″ four cycle engine with a Tecumseh 5hp or Honda 9hp engine or TGB212, indicates a 21″ 2 cycle Kawasaki. NOTE: Part numbers or engine sizes noted above are only for an example and may not be currently available.

How do Air Flex blades hold up in cold weather?
The Tempest Air Flex blades are operationally rated at -50 °F through +250 °F – which covers the range of most normal operations of the blower.

Can early Tempest blowers be retrofitted with the new Air-Flex blades?
Earlier Tempest blowers can be retrofitted with the new Air Flex blade. The Air Flex blades have been AMCA tested on the belt-drive, direct-drive, and electric blowers with increased CFM of as much as 30%. Call Tempest Customer Service for more info on retrofits.

Can other manufacturer’s blowers be fitted with the Tempest Air-Flex blade?
The Air Flex blade is designed and engineered specifically for Tempest Power Blower models. While the Air Flex blades could be “fitted” to the shaft of other fans or blowers, without specific engineering of the impeller to a particular engine and shroud design, results could not be guaranteed.

What does CFM mean?
CFM stands for “Cubic Feet Per Minute”. It is a measure of the blower’s air movement performance. The CFM performance of all Tempest Blowers is tested and certified by a third party organization, Air Movement and Control Association, called AMCA. This ensures that our customers receive accurate performance information.

How can I find out the CFM of a particular blower?
A complete listing of the CFM ratings for all Tempest blowers can be found on our web site. This information is also available in the current Tempest product catalog and can be requested by calling Tempest Customer Service.

What is the difference between a blower with a shroud and a blower with a cage?
A shroud is one of the most important features a blower must have for effective PPV. The shroud helps to shape the airflow into a cone shaped pattern and, with the Turbo 2000 Shroud, the slight taper increases the forward velocity and pressure of the air. It is this “cone of air” that allows you to completely seal the entrance opening and pressurize the structure. If it could be seen, the cone would look like a beam of light off a flashlight.

A blower that uses a cage instead of a shroud is not able to shape the air and produce the “air cone”. A caged blower creates a shaft of air. This means that the blower will have difficulty trying to achieve the proper seal on the entrance. Placing the blower farther away reduces its velocity and performance for PPV.

How long will my blowers last?
The Tempest Power Blower has proven its durability by withstanding the rigors of fire and industrial service use. Tempest initiated the “Five Year Warranty” for PPV blowers in the fire service.
Tempest started manufacturing blowers for the fire service in 1987 and many of the blowers that we sold in the beginning are still in service.

Which industries currently use Tempest Power Blowers?
The primary use for the Tempest Power Blower is for firefighting. Firefighters use our fans to conduct positive pressure ventilation/attack (PPV/PPA) to remove the heat, gas, and smoke from a burning building as they attack the fire inside. This creates a safer environment for the firefighters by allowing them to enter in a cool, clean, upwind environment. PPV/PPA also helps firefighters find victims faster for rescue and locate and extinguish the fire.

Contractors use the Tempest Power Blower to remove dust, fumes, odors and carbon monoxide from confined spaces similar to the same way firefighters use the Power Blower. Positive Pressure Ventilation is proving to be a very useful tool for improving the health and safety of workers. Almost any industrial or commercial project that temporally requires large amounts of air movement, negative or positive pressure, can benefit from a Tempest Power Blower.

There are many other applications and industries which utilize tempest ventilation products. You can view the common applications under our Industries page. Tempest also specializes in custom ventilation solutions and projects, so if you don’t see your industry or need listed, please contact us and we’ll work with you in developing a specific option just for you.

Whom do I call if my blower needs service?
You can call the dealer you purchased the blower through or contact the factory at 800.346.2143 or General maintenance and repairs to out-of-warranty gasoline engines can generally be accomplished by contacting an authorized small engine repair shop near you.

What is the difference between direct-drive and belt-drive, which one is best?
A Belt-Drive Blower uses a pulley system to power the blade. On a Direct-Drive Blower, the blade is mounted directly to the shaft of the engine.

The Belt-Drive system is a more efficient design and eliminates vibration and movement while the blower is operating while the direct-drive system is more economical. The Belt-Drive system is also most efficient because:

  • The engine sits lower on the blower. This creates a smoother, straighter flow of air due to less blockage of the intake area. The engine also sits lower on the frame, lowering the blower’s center of gravity. This makes it more stable and reduces vibration.
  • The gasoline engines used on the Tempest Power Blower are designed to turn a pulley or gear, connected to a belt or chain (Power Take Off, or PTO). This is the proper application of a PTO engine. This design will extend engine life because there is less stress on the engine bearings.
  • The belt helps to absorb engine vibration. By limiting the amount of vibration transferred to the rest of the unit, the blower will not “walk”. It is important that the blower remain in place for PPV operations.
  • The RPM of the blade can be “tuned” by varying the size of the pulleys. This allows us to take advantage of the unique torque curve of each engine, thereby maximizing blade RPM and airflow performance.

The direct-drive system is less expensive because:

  • There are fewer precision parts in a direct drive system.

How long will our blower run on a tank of gas?
Run times will vary depending upon the speed of the engine. The average run time, depending on fuel quality, for a tank of gas is approximately one to two hours.

How can I find out the dB noise levels?
You can receive a list of the dB levels of various Tempest Power Blowers by contacting Tempest Customer Service at 800.346.2143 or

How can I find out the weight and dimensions of my blower?
A complete listing of the weight and dimensions for all Tempest blowers can be found on our web site. This information is also available in the current Tempest product catalog and can be requested by contacting Tempest Customer Service.

Is Carbon Monoxide a problem? How can I prevent this?
The exhaust of all internal combustion engines generates Carbon Monoxide (CO). Above certain levels, CO can be fatal. Tempest offers an Exhaust Extension that can be attached to the muffler of all gasoline-powered models. This is designed to move the exhaust away from the blower’s intake, limiting the amount of CO that is pulled into the blower. We also offer a catalytic converter called the GESi which can be retrofitted onto current Tempest gasoline PPV fans with Honda® engines. This simple bolt on attachment reduces up to 70%-99% of the harmful bi-products which result from engine combustion.

Tempest also manufactures a large selection of clean operating, electric fans that are available with optional Explosion Proof Motors that can be used where feasible and necessary. Contact our Customer Service Department for specific information about this subject.

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Ventmaster Ventilation Rescue Saws

What is the difference between the VentMaster Fire/Rescue Saw and other chain saws used by the fire service?
The VentMaster has been specially designed for fire and rescue applications. Features incorporated in its design enhance its ability to work in heat, smoke, rain and other harsh environments found only in fire and rescue work. Yet the saw will do all the other things a typical chain saw is expected to do. Engine design, bar and chain design, and the KIS-40 Depth Gauge are explained in our literature and on our web site.

What kind of power head does the VentMaster use?
All VentMaster saws use a powerful, commercial grade Husqvarna power head modified by Tempest for Fire and Rescue use. It has the highest power to weight ratio and the least vibration of any power head on the market. It has proven its ability to stand up to the rigors of fire and rescue use.

What type of chain is used on the VentMaster?
The VentMaster features the exclusive Raptor Carbide chain. It is a .404 (also available in .375) pitch; .063-gauge chain built to Tempest’s specifications and it is designed to cut through many materials encountered during fire and rescue operations. It features a dual, open raker design, which provides extra protection for the carbide cutter and allows the chain to self-clean and ventilate. It also features a wide gullet, which allows the saw to cut more material, faster than narrow gullet saws. These features also reduce the heat build up during heavy metal cutting. The Raptor Carbide Chain stays sharper longer and retains cutter life longer than other carbide chains used by the fire service.

Can I put the Raptor chain on my existing chain saw?
Yes. Most chain saws can be fitted with the Tempest Raptor carbide-tipped chain. The power head must be 5.4 hp or greater to maintain the proper speed for the .404 Pitch/.063 Gauge Raptor Carbide Tipped Chain. A 4.5hp or greater saw head must be used to run the .375 Pitch/.063 Gauge Raptor Chain.

What is the cost of sharpening my Raptor chain?
In some cases cutters will need to be replaced at the same time that the chain is sharpened. Contact Tempest Customer Service for additional information on chain repair prices.

Can I put the VentMaster sprocket-nose bar on my existing chain saw?
Yes. Tempest sprocket-nose bars will fit a variety of chain saw makes and models and can upgrade most saws of recent manufacture.

Can I put the KIS-40 adjustable depth gauge on my existing saw?
Yes. You can purchase a professional VentMaster sprocket nose .404 pitch, .063 gauge bar, designed specifically for the KIS-40 depth gauge and Raptor Carbide Chain. If your current saw has a one-piece bar and is at least 16″, you can have it machined to fit the KIS-40.

What is the RPM and chain speed of the VentMaster?
The VentMaster has a maximum no load chain speed of 93.5 to 99.1 feet per second. The power of the VentMaster power head maintains the critical speed of the chain in heavy cutting that allows the cutters to remain intact and to cut quicker.

What types of materials can the VentMaster saw cut through?
The VentMaster can cut through wood framing, sheet metal, asphalt shingles, and green wood. It is even effective on metal roll up doors commonly found on industrial warehouses. It can also cut through car bodies, hoods, and windshields.

Does Tempest manufacture a rotary cutoff saw?
Yes. Contact Tempest Customer Service at 800.346.2143 or for more information on the VentMaster 375K, 397K and 3120K rotary cutoff saws.

Can I use a gas stabilizer in the VentMaster fire rescue saw?
The Tempest VentMaster is equipped with Husqvarna power heads. If the recommended Husqvarna XP 50:1 oil is used, it has a gas stabilizer in the mixture that increases storage time up to 120 days. Additional stabilizers should not be used.

What causes the carbide-tipped cutters to chip or break off?
Chain speed and power are critical in the use of carbide tipped chain. The power head of the VentMaster Fire/Rescue Saw will supply plenty of torque to keep the speed of the chain at full speed providing it is tuned and operating properly. Air filters should be kept clean and fuel mixtures should be proper and fresh.

It is essential when using a carbide-tipped chain to enter the cut with the power head at full throttle, keeping it at full throttle while making the cut and while exiting the cut. When cutting through materials with nails or metal, do not force or put added pressure on the chain. This can cause unwanted chipping or breakage of cutters. Let the speed of the chain do the work. Any slowing of the chain while cutting can cause the cutters to break off or chip.

Can the raptor chain be used to cut trees and other wood items?
Yes. The Tempest Raptor chain has an open raker and wide gullet and can be used to cut trees and other green wood materials without becoming clogged. However, it should be noted that the Raptor Carbide Chain was designed for the fire service encountering a variety of materials (wood, nails, metal, plastic, etc.). Softer grade carbide performs better but will wear faster than the harder carbide that is strictly used in the forestry service.

What is the gas-to-oil ratio for the VentMaster saw?
The mixture should be 50:1 using a good quality petroleum-based oil such as that offered by Husqvarna. Never use synthetic oils in the fuel/oil mixture.

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Tempest Electric Blowers

What are the power requirements for Tempest electric blowers?
Tempest has developed a chart showing the power requirements of our electric blowers. It explains the generator, amperage, wattage, circuit breaker requirements and cord gauge as well as the maximum cord length for various models. It is available in the Download Library on the Tempest web site.

Can I get my electric blower with an explosion proof motor?
Yes. Explosion proof motors are available on most Tempest electric models. Be sure to specify this when you place your order.

What does TEFC mean?
TEFC stands for Totally Enclosed Fan Cooled. This is a type of motor that, among other things, can be operated in dusty environments.

When should I use an “explosion proof” motor?
An explosion proof motor should be used any time the blower is operated in an explosive environment. There are different grades of explosion proof motors based upon the type of environment. Be sure to specify the type of environment that the blower will operate within when ordering an explosion proof motor.

What can cause a blower to overload a circuit breaker?

If the breaker is not sufficient to handle to starting amps of the blower, the breaker will activate. The starting amps are a momentary jump in amps, which are required to get the blade up to operating speed. (All Tempest standard electric blowers require a 20 Amp breaker.)

As circuit breakers age, their resistant to spikes in amp draw will deteriorate. Also, operating more than one piece of equipment on a generator will limit the amount of power that a circuit breaker can handle.

Why is the 220V electric blower delivered without a plug?
Generally, when working with 220 Volts, someone with electrical experience or training should be involved with the deployment and set up of these units. There are many variations of prong configuration for 220-volt plugs. The blowers are shipped without a plug so the customer can use an experienced installer abiding by local protocol and regulations to properly attach the plug best suited for their needs and location.

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What is AMCA?
AMCA (Air Movement Control Association) is an independent testing organization for manufacturers of air movement devices. They have developed a series of standards and testing criteria for different types of fans and blowers. They have developed a standard specifically for Positive Pressure Ventilation blowers called 240-96.

Tempest was the first PPV manufacturer to have their blowers tested and certified by AMCA. Since that time, many other manufacturers have begun using AMCA to certify the performance of their products. When you buy an AMCA certified product, you can be assured that the CFM numbers you receive are accurate.

Before buying any fan or blower the consumer should insist that the performance of their purchase be Certified– not just tested, by a third party source using the AMCA PPV Test Standard #240-96. You can learn more about AMCA by visiting their web site at

Be cautious of companies that claim to have “AMCA tested” but not “AMCA certified” products. A blower may be AMCA tested but not AMCA certified. Insist on AMCA certification and get the facts!

Does the CFM rating include entrained air movement?
Yes. The AMCA-240-96 Test Standards used by Tempest to certify our Positive Pressure Ventilation Performance (measured by “CFM rating”) takes into consideration the “entrained air” moved by the forward velocity of the power blower as “set back” from the entry way into the test chamber.
This test standard was developed by the PPV manufacturing industry in conjunction with AMCA to allow any fan or blower or air mover, of any design – whether caged or shrouded, prop blades or turbo blades, centrifugal or vane axial, gas or electric, etc. to be tested.
The CFM ratings as the result of AMCA #240-96 certification include ALL air, forced or entrained, forced “through the door and coming out the back door” of the test chamber.

How can a smaller blower produce more CFM than a larger blower?
A number of variables affect the CFM testing results conducted by AMCA. The distance the blower is set back away from the entrance. Engine rpm can vary up to 15% according to the manufacturer. The engineering of the impeller to a given engine horsepower and rpm in regards to the diameter of the blades, the number of blades, the pitch of the blades, and placement of the blades within the shroud are just a few of the factors that can influence the performance of the blower. The profile of the engine behind the intake area of the shrouded impeller is another factor. Tempest continues to re-engineer and test our blowers to gain maximum performance from each blower we manufacture.

What does “set back” (S/B) mean?
Set back is the optimal distance that a blower should be placed away from the entrance opening for the highest volume of CFM and is determined during AMCA testing. The blower is tested the first time and then moved forward and tested. If the CFM increases, then it is moved forward again. If the CFM falls from the first test, the blower is moved backward past the first test spot and run again. If the CFM increases it is moved further back and again tested. The end results are the Set Back is the point at which you get the highest CFM.

Why is the AMCA CFM rating so low on the older blowers when the new blowers are made the same way?
The first AMCA tests back in 1989 were performed using the AMCA 210 standard. This was not the best method for testing PPV blowers because it did not take into consideration that the blower is placed away from the entrance opening. In 1995, AMCA developed the latest test standard, AMCA 240-96, with the assistance of a committee of PPV manufacturers. The new standard was a more effective measure of a blower’s performance and the test results were around 30% more than with AMCA 210 test.

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Smoke Machines

What are the CFM’s of the Tempest Shadow smoke machines?
There is no standard third party testing for measuring the density or output of smoke machines.

Fluid Throughput
Rosco feels it is better to compare smoke machines by fluid throughput (fluid consumption), since there is no testing standard.

Dusk – 1 liter per hour
Nightfall – 3.6 liters per hour
Blackout – 7.2 liters per hour

Smoke Density
Rosco smoke fluid provides the densest smoke available because it has a higher ratio of chemicals (glycols) to water than other brands.

Which Shadow smoke machine is the equivalent to the older Tempest 1601, 1801, and 9000 Power Smoke machines?
The Tempest Shadow is comparable to the older Tempest 1601 machine and 1801 smoke machines. The Tempest Shadow 1 is equivalent to, the Tempest 9000 smoker and 5000 fogger.

What type of smoke fluid should I use in my smoke machine?

You should use only Tempest Shadow “Rosco” smoke fluid in Tempest Shadow “Rosco” Smoke Machines.

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Can I order an exhaust extension hose to use with my blower?
Tempest’s 10′ X 2″ exhaust extension hose provides the best solution for preventing CO from being drawn into the air stream of a PPV blower. All Tempest blowers manufactured after July 1, 1999 are equipped with a 2″ muffler deflector to accept the 10′ X 2:” exhaust extension.

Many earlier models may also be retrofitted with this hose. The earlier Tempest TGB models can be retrofitted to accept the exhaust extension. Blowers manufactured between September 1993 and June 1999 need the Universal Muffler Adaptor. Contact customer service for retrofitting blowers manufactured prior to September 1993.

Visit our web site Download Library to view independent test results of CO concentrations while using the Tempest Exhaust Extension Hose.

Why are mounting holes not drilled in replacement shrouds?
When replacing a shroud, holes need to be drilled in the shroud because it is not possible to pre-drill the holes at the factory and have them match the existing holes in the frame.

Are wheel kits available for the Stubbys (CA 1800, CA2100M, CA2400)?
Wheel kits are not available for these earlier Tempest blowers, which were manufactured by “Controlled Airstreams” (CA), a company that Tempest purchased in 1990.

Are wheel and handle kits available for early Tempest blowers?
Retrofit Wheel and Handle kits are available for blowers manufactured with out wheels or handles (1986-92 models). Between 1991-92, wheels and handle were offered as an option. All are still available. Call Customer Service at 800-346-2143 with your model and serial number for prices and availability.

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Product Maintenance

Is there a lot of maintenance required for a Tempest blower?
Tempest Power Blowers require minimum maintenance. However, as with any machinery, “basic maintenance” is necessary to assure longer life and reliable operation. Belt Drive blowers generally will be more dependable, require less maintenance, and have a longer life than Direct Drive blowers. Again, be sure to follow the simple maintenance guidelines as outlined in the literature sent with the original blower from both Tempest and the engine manufacturer to assure reliable operation and longer life – and to protect your warranties.

What can cause a blower to vibrate or shake?
If the impeller is not attached properly to the power shaft it can create a wobbling effect and cause excessive vibration or shaking.

On Direct Drive units, engine shaft bearings can become worn with the same results. When bearings have become worn, the shaft will not be centered and can cause the blade to wobble when in motion which will cause the blower to shake.

Why does a blower “walk” or move from a stationary position?
Movement from a stationary position or “walking” occurs because of vibration – not the fact that the impellers are pulling/pushing air through the shroud!

Direct Drive blowers have a tendency to “walk” if not monitored properly and set up correctly. Direct Drive blowers can also begin to vibrate badly and produce a grinding noise when there is engine shaft bearing wear. However, with the NEW Tempest Air-Flex Impeller, and the improved small engines used by Tempest today, there is less vibration to produce movement and shaft bearing damage.
Belt Drive blowers do not “walk”! The belt acts as a buffer for the vibration created by the motor and possible intake air current disturbance to the impeller.

What will cause a belt to break?
If the belt is not adjusted properly it can wear prematurely. A belt that is too tight can cause unwanted wear on the bearing assembly.

How do I get the blade off the shaft?
Contact the factory before attempting to remove or replace the blade. Step-by-step instructions can be found in the Blower Operations Manual.

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