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Tamarack HV Series Techs and Specs -
Whole House Fans

Features & Specs for Tamarack Attic Ventilation Fans

Install Location

The HV whole house ventilation fan should be placed on the framing between the space to be cooled and the attic. In most cases that means the attic floor, but the HV can also be mounted vertically to cool cathedral or vaulted spaces. Locate the system as close to the center of the home as possible for an even draw throughout the home.


Each HV1000 / HV1600 system includes a standard SPST toggle on/off switch. Other methods of operation are available. You may use these methods individually or combine them to achieve maximum control.

The HV1000 is a single speed fan and will not work properly with controls such as the Airetrak which are designed to operate variable speed fans. The HV1000 will not operate with the Humitrak due to component factors.

Remote Control:
The dedicated remote control system offers the user a simplified 110 volt powered remote control. The system includes a hand-held transmitter, which operates on a 12-volt battery (included), a receiver which has been built into the fan, and a wireless wall switch. The transmitter features a signal operating light that goes on when the ON or OFF buttons are depressed. The controls offer 256 unique security codes that are factory programmed into the system allowing multiple remote control units in the same room or building. The systems operating distance is 60' and is not restricted to "line-of-sight" applications because the system uses radio frequency control. It operates on the R.F. frequency of 303.875 MHz. The control is UL listed and is FCC certified in the U.S. and I.S.C. certified in Canada.

  Model HV1000 Model HV1600
Power Requirement 115VAC 60 Hz
Fans Running 116 watts 276 watts (Full Speed)
Lift Motors Running 6 watts 6 watts (Full Speed)
Open/Close Time 30 Seconds 30 Seconds
Air Flow @ .1" SP 1000 cfm 900 cfm low
1600 cfm high
Sound Level 3 Sones N/A
R Value when Panel Closed R-22
(optonal) R-38
Rough Opening 14.5 inches x 22.5 inches
Height w/ Doors Open 11 inches at R-22
12 inches at R-38
Grille Color White
Grille Size Rough Opening: 23 1/4" x 13 7/8"
Outside Diameter: 25 3/4" x 15 3/4
Weight 24 lbs.
(shipping 32 lbs.)
Pressure relief required 1.5 Square Feet - (Open Space in Attic)
New 1.5 Square Feet - (Open Space in Attic) 3.0 Square Feet - (Open Space in Attic)

Air Flow Fan Sizing
How much air needs to move through your house to make it cooler? The following table shows estimates of how quickly all the air will move through different size houses with different size whole house fans.
House Size Model HV1000 Model HV1600 Typical 24" Fan Typical 30" Fan
Air Flow 1000 CFM 900 CFM
1600 CFM
3000 CFM 6000 CFM
1500 square feet 12 minutes 7.5 minutes (high) 4 minutes 3 minutes
2000 square feet 16 minutes 10 minutes (high) 5.33 minutes 2.67 minutes
2500 square feet 20 minutes 12.5 minutes (high) 6.67 minutes 3.33 minutes

Technical Evaluation

Attic Cooling
When heat builds up in the attic, some of that heat will transfer into the house. It is similar to having an overheated blanket covering the top of the house. This will increase the temperature of the interior of the home. This increased interior temperature has a negative effect on human comfort. Additionally there is ongoing research on the negative effects of excessive heat on building materials. The traditional answer to this problem is to ventilate the attic with either passive or powered ventilation, moving air through the attic to reduce the temperature.

Passive ventilation:
Many homes have passive attic ventilation in the form of ridge vents at the peak of the roof, gable vents at the ends of the roof, soffit vents in the eaves, or some combination of these vents. Turbine and/or roof vents (passive vents that penetrate the roof) are also used. A driving force, such as wind or a pressure differential, must be present for air to move. The hottest days of the year are the calmest, with little or no wind.

Power ventilation:
Attic exhaust fans are roof or gable mounted fans that draw air out of the attic, relying on passive vents to supply cooler outside air to replenish the air being exhausted. An attic fan does not exhaust the heated air from the living space.
Whole house fans are mounted in the attic floor pushing house air out through the passive attic vents and bringing cooler air into the living space through the windows. This directly cools the inside of the home, enhancing the comfort level for the occupants. The greater the air flow generated by the whole house fan the greater the area of the passive attic vents must be to relieve the attic pressure. If the relief vents are too small, the air will "squirt" out through any available hole, which can damage building materials. At the same time, excessive pressure will reduce the effectiveness of the fan, and materials in the attic such as insulation and stored items can be blown about. The relief opening should be based on: 1 square foot of opening for each 650 cfm (cubic feet per minute) of air flow. Using this formula, a 1000 cfm fan would require about a 1.5 square foot opening and a 6000 cfm fan would require a 9.25 square foot opening, equivalent to about five 12" turbine vents or 14 roof vents.

Removing the "blanket" of hot air in the attic can help to reduce the temperature in the home. Although an attic exhaust fan can effectively exhaust the hot air from the attic, it does nothing to exhaust the hot air in the home. A small whole house fan can do both jobs - reducing both the attic and house temperatures. This will only work effectively throughout the year, however, if the whole house fan is sealed when it is not in use.

Cooling Savings:
To start with, a whole house fan can often be used in place of using an air conditioning system. There are many days in many parts of the country where the conditions are ideal for just drawing in fresh, cooler outside air to replace the over heated inside air. For every degree Fahrenheit that a thermostat is raised , air-conditioning costs can be reduced by 7 - 10%. Since air-circulation with a fan allows a thermostat increase of 4º F with no decrease in human comfort, a fan can provide as much as a 40% savings in cooling cost.

Operationally, a central air conditioner costs 20 times more per hour than the HV1000.

A window air conditioner costs 17 times more per hour than the HV1000.

Operating a properly sized, 2-ton air conditioner with a seasonal energy efficiency ratio (SEER) of 10 in Atlanta, Georgia, costs over $250 per cooling season (1,250 hours) based on 8.5 ¢/kwh or roughly 20¢ per hour of runtime.

A large, 18,000 Btu/hour window unit air conditioner with an energy efficiency ratio (EER) of 8.8 costs more than 17¢ to operate for one hour.

By contrast, an HV 1000 whole house fan draws only 115 watts and costs less than 1¢ per hour of use.

CFM: Cubic feet per minute - this is a measure of the volume of air moving in one minute
FPM: Feet per minute - this is a measure of the rate of air moving in one minute
R value: The ability of a material to resist the conductive flow of heat. The higher the R value the greater the resistance.
Reff: The average R value for an area such as an attic floor.
U value: The ability of a material to conduct heat. The inverse of the R value.
Conductance: A term referring to the U value of a material. The flow of heat energy from molecule to molecule, molecules warming or their neighbors.
DD: Degree Day - "The number of degree days in one day is the difference between the average temperature for that day and 65º F. The accumulated number of degree days during the heating season is kept by the weather bureau as an indication of the amount of fuel consumed. A similar concept is cooling degree days, the difference between the average temperature and 78º F."
BTU: British Thermal Unit: A measurement of heat energy. One BTU is about the energy in a single kitchen match.
Convection: The flow of heat energy via fluid or gas motion.
Pascal: A metric measurement of pressure in a very small increment. One thousand pascals equals 0.145 pounds per square inch.

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