Frequently Asked Questions

Whole House Fans

How will a whole house fan save me money?

Using a whole house fan versus air conditioning will save you money as it can be used to bring cool air into the home without the use of an air conditioner!  Properly ventilating your home and attic can save you from having to perform costly renovations due to extreme heat and dampness. 

Do the Tamarack whole house fans require any maintenance?


How does the Tamarack whole house fan look from inside my home?

You can’t see the whole house fan from the living space. You will see a low profile, slotted grille, similar to retrun air grille which is affixed to the ceiling

What comes with the unit?

The HV1000 and HV1450 come with an interior grille.  HV1600 and Ghost come with a hand held remote control and an interior grille.

What is the warranty?

Ghost, HV and TC models-3 years. The QC2000 is 90 days.

Can I use whole house fan in commercial buildings?

Yes, please check local building codes.

Do I need an attic fan?

It is your choice however,  whole house fans pull cool, fresh air into your home and at the same time push hot stale air out through existing attic ventilation thereby lowering the attic temperature.

Will the whole house fan work when my attic fan is running?


When do I run the whole house fan?

When ever you want the outside air brought into the home.

Can I use a timer or thermostat to control the operation of the Tamarack whole house fan?

Yes, a line voltage intermattic manual crank timer can be used. No, a thermostat can not be used.

Why plastic blades and not metal?

Tamarack uses plastic fan blades in order to get the most efficient and quiet fans possible.

Are your whole house fans easy install?

Yes. They are great do-it-yourself projects.  No power tools or special equipment are required. 

How long does it take to install?

Approximatley 1 hour.

Where do I install the whole house fan?

At the most centered highest level in the home on the attic floor.

Can I duct my whole house fan to the outside?

This is not recommended as there is a significant decress in air flow when ducting is used to exhaust the fan. 

Should I install the whole house fan on the roof or on the gable ends?


I don’t have an attic, what do I do?

Review the TC1000-H. Specifically desinged for a through the roof or wall application or the Infinity fan

Do you have installation guides?

Yes. An installation guide is provided with all products and available on the product page at

Do I need an electrician?

Tamarack recommends a licensed electrician.

Do I need a dedicated circuit?

Please consult with your electrician and local building codes.

What is the difference between the HV1000, HV1600 and the Ghost?

There are several differences between the models of the Tamarack whole house fans; most noticeably the CFM. Please refer to the product specification sheets for further information.

How quiet are the Tamarack whole house fans?

HV1000; 55 dBA
HV1600; 55 dBA on low and 65 high
Ghost; 55 dBA on low and 65 dba on high

How do the HV1600 and Ghost compare for noise?

Noise is relative to installation method and placement, please see db ratings above.

What is the cfm of the Tamarack whole house fans?

HV1000 - 1,150 cfm.
HV1600 - 1,600 cfm high/1,150 cfm on low.
Ghost - 3,400 cfm high/1,900 cfm low. 

Can I install the HV from inside my living space rather than from inside the attic?

Depends if the hole going in the ceiling is larger than the dimensions of the fan.

For the HVs, how much clearance is needed above the whole house fan?

 2 feet for the HV models and 4 feet for the Ghost. (above the joist)

Can I get the HV1600 without the remote?


Do I need a special switch for hi/low speed?

No.  The switch is a simple On/Off  Single Pole Single Throw (SPST) switch.

Can I get a second remote for my HV1600?

Yes, please mention when ordering so we can program both remotes to work with the same fan. 

Does the remote control have a timer?


Can the HV1000 Remote kit be added after the HV1000 is wired to a switch?


Can the HV be installed vertically, in a wall?

Yes.  Mention at time of order so the correct return air grille is supplied.

Does the Ghost mount on the roof?


Can the Ghost be vertically mounted?


What is the rough opening for the Ghost?

14-1/2 inches by 22-1/2 inches


What is the difference between the TC–T and the TC-H?

• The TC-T is a two speed unit (500 and 800 cfm) controlled by a thermostat (included).
• The TC–H is a single speed, 800 cfm unit, provided with a spdt wall switch.

What comes with the TC?

The TCT comes with a wall mount thermostat, The TCH comes with a regular wall switch.

Will I need to purchase anything else?

If you have an insulated roof system you may need a thimble.  An interior grille is a popular accessory with the TC-H models.

Will the TC work with my pool or spa?

Yes. We strongly recommend the use of a non-chlorine based cleaner.

Are there chemicals that I can use that won’t damage the TC?

Yes, non-chlorine base and the like.  Please consult with the pool or spa manufacturer. 

Will my TC prevent water from condensing on interior surfaces?

The TC will assist.  Most of the causes of water condensation are directly related to temperature differential.  Extremely warm, moist air will condense on colder solid surfaces.  The closer the two are in temperature the less the condensation will occur.

Can I use the TC to vent heat from my greenhouse?


Can I use the TC to exhaust cooking heat and odors?

Yes, but it is not recommended as a substitute for the kitchen range hood.

Will the TC cool my sunroom or living space?

Yes, provided the outside air is cooler than the inside air and you are pulling that outside air in through a open window.

Can the TC be used to ventilate my smoking room?


Will I need more than one TC?

Air flow and alternative cooling is a personal subjective matter, please call us and we can go over your options.

How many TC’s can be linked together?

3, all need to be on the same phase.

What colors are available for the TC models?

Brown or white.

What is the housing size?

Multiple Housing sizes are available, please call us.

What is the rough opening?

The rough opening is 12-3/4" x 27-3/4".

What is the internal thermostat?

The internal thermostat controls the change from low speed to high speed for the TC-T.  When the temperature at the TC-T climbs above 90°, the fan will shift from 500 cfm to 800 cfm. When temp at the fan height falls below 90° it will shift back 500 cfm (these temperatures are all approximate).

Do I need a thimble?

If you have an insulated roof system, you may need a thimble.  An insulated roof system is made up of a foam panel sandwiched between two sheets of either aluminum or vinyl.  The thimble will protect the foam from being sucked into the fans.  In most solid roof applications the framing structure acts as the thimble.  In some retro-fit applications where the TC will be installed in a previously insulated wall or roof and a complete frame will not be built, the thimble may be necessary. The thimble can be used with either the TC–T or the TC–H. 

How do I determine the size thimble I need?

The thimble depth dimension is determined by subtracting 1/2 inch from the overall roof thickness.  Overall roof thickness is measured from the outside of the exterior sheathing to the inside face of the interior sheetrock.

What size thimbles are available?

The outside dimensions of the thimble are 27? x 12-1/2?
Available thimble depths are: 2-1/2, 3-1/2, 4-1/2 and 8-1/2.  They can be trimmed in the field as needed.

What is the flange?

The flange is an integral part of the housing that is used to mount the TC into the glazing or onto a solid roof or sidewall.  The length, width and thickness dimensions of the flange will vary, depending on the glazing system or roofing system in your sunroom or roof.

What determines the flange thickness?

In many applications the TC-T is replacing a glass panel.  Individual manufacturers have different glass panel thickness.  As an example, a 1" flange is made up of the 1/8" thick upper housing, the 1/8" thick lower housing and a 3/4" thick spacer.  The 1/4" flange thickness of the TC–H is the bonding of the upper housing directly to the lower housing.

What TC-T flange sizes are available?

Maximum flange size: 37-3/8" x 19-1/4" x 1.
Minimum flange size: 29-5/8" x 15-1/8" x 1/4.
Standard flange thicknesses are 1/4", 7/8" & 1"
Please contact us prior to ordering.

What is the flange size of the TC-H?

The standard flange size is 36" x 16-5/8" x 1/4".  The flange can be altered in the field.

Do I need a grille?

No.  However, many customers prefer the look of a return air grille in the interior space to the look of the eggcrate grille which is attached to the lower housing.

What size is the grille?

The grille size is 30 x 14 for horizontal installations or 14 x 30 for vertical installations.

What types of controls can be used?

TC’s can be controlled by any SPST wall switch, a line voltage thermostat, electro-mechanical crank pin timer, all types of mechanical closure timers, a line voltage thermostat, standard 2-wire humidity controls or a combination of most any type of line voltage control.

What control is provided with the TC?

The TC–T is supplied with a wall mounted line voltage thermostat.
The TC–H is supplied with a SPST wall switch and cover plate.

What color is the wall mounted thermostat?


What color is the SPST wall switch and cover?


Why do I need a 3-wire power supply?

Power to the fan is still necessary, even after you shut the fan off. The damper requires power to close.

Can the TC be mounted on a vertical wall?

Yes.  It would be best if the TC were to be located under an overhang or some type of structure that will prevent water from entering the housing when the fan is in opening or closing mode.  The TC can be oriented on either a horizontal or vertical plane. 

Can the TC be mounted on a flat roof?

Yes. If the roof is “flat” and there is the possibility of standing water or puddles of water a curbing should be built up.

What is a curbing?

Curbing is a build up on a flat roof allowing the TC to sit above potential puddling.

Can I mount the TC on a “standing seam” metal roof?

The customer should contact the roofing manufacturer for instructions.

What if I have an insulated roof system?

If you have an insulated roof system, you may need a thimble. Please see Specifications.