9 SIZES FOR YOUR ATTIC FROM 1000 CFM TO 12,600 CFM
5 fans need only one duct
The reason is that the most common ducts come in sizes up to 20 inches diameter.
$500 $900 $1000 $1500 $1800 Here are descriptions of all the other suppliers of whole house fans like those above – I am posting this data here to save you time.
Other whole house fan builders as of 5-8-23 are
- Airscape
- CentricAir
- QA Delauxe
- QuietCool
If you have heard of ComfortCool they have changed into a distributor for other brands. And Tamarack is now selling Airscape fans.
Airscape has 2 series of attic mounted fans , “Sierra” and “Ventura”. And a 3rd fan style, the Direct Vent System, which is designed for homes with no attics. The Sierra line comes with more expensive motorized damper doors and the Ventura comes with economical gravity dampers. And those fans have 2 useful air flows. The prices are
- Sierra 3400 3.440 CFM $2,049
- Sierra 5300 5,527 $2,289
- Ventura 3200 3,132 $1,459
- Ventura 5300 5,497 $1,799
- The DVS offers 5,527 CFM at 932 watts for $2,819
The 4 larger fans below are a unique invention of mine created for homeowners who wanted the higher CFM you get in the noisy ceiling mounted fans but without having to see or hear the fan. I designed what I call “collector” boxes to enable us to connect the higher air flow through 20 inch ducts ( the largest off the shelf ducts) to the bedroom and hallway ceilings. The result was perfect! Below is a picture of one very happy homeowner, Gearard, at his window with the wind blowing in. His whole house fan is the 30 inch below. The 36 inch was installed in a home in Temecula.
1 SIZE FOR YOUR ROOFTOP 8025 CFM
In the picture below you can see the powerful 1/2 HP US Motors EC motor (Electronically Commutated Brushless DC Motor) that is guaranteed to operate flawlessly for 16 years or more. The box wired on top is the speed controller so the motor has infinitely variable speeds. This means you can set the speed as low as 50 RPM at night to cool your home all night for pennies. The input power is nearly perfectly proportional to the speed. So at full speed the power is 525 watts but at low speed it is under 100 watts..
The price of the Invisco Tornado rooftop is lowest ……….when looking at the price per cubic feet per minute (COST/CFM) (47 cents) (Data from 2023 specifications)
INDUSTRIAL BUILDINGS
ROOFTOP OUTPERFORMS ALL OTHERS
The reason is the turbine rain hat. Air can go up and out freely. Others use big boxes for hats that force the air to go down before it can go out.
FIRE SMOKE ROOFTOP IS DESIGNED BETTER
The Invisco design is direct drive – no belts to melt. So there is no limit to time at 1000 degrees F.
The reason the ventilators above are so much better is NOT my brilliance, it is because of the engineers at CSR Edmonds in North Ryde, Australia. THEY are the ones who thought up this brilliant vertical blade turbine rain hat.
THE PICTURE ABOVE SHOWS THE REASON FOR THE HIGHER PERFORMANCE
You can see that the turbine blades in the Aussie rain hat allow all the air to move up and out with NO restriction. This is the heart of Invisco’s high performance!
The picture to the right is the LorenCook invention, a curved top edge of the throat to make it easier for air to flow over and down. But why do they have that wall smaller at the top??
2023 Update on Invisco Products Sales Forecast
2023 Update on Invisco’s design in Los Angeles
The Invisco Tornado is the world’s first high performance hybrid. James Shwe used my Tornado on a new gymnasium for Studio City in Los Angeles County. He put Edmonds on the design first, then added Invisco in 2016. Then the engineers in Los Angeles saw that the Tornado’s performance is so much better they deleted Edmonds from the design. You can see the case study here – http://invisco.com/invisco-industrial-hybrid-rooftops/case-study-studio-city-gymnasium/
HERE IS AN INVENTION NEVER BEFORE SEEN – A MOTORIZED WALKER
