This is relief air, not makeup air. Unless you add a fan powering this setup you will always have to have negative pressure in the house for it to “work”. It merely relieves PART of the air being drawn out of the structure. Even Broan tells you to install multiples of these to “comply” with code. No active fan? No makeup air. Bad information in an already poorly understood segment of the market (the V in HVAC). Every home performance expert will tell you the same. The size of a passive hole you need for any decent sized exhaust hood is HUGE.
The product is designed to be installed on a range hood, which always has a fan. See the product manual for clarity. www.iohvaccontrols.com/images/file.php?file_id=16255
@@iohvaccontrols522 You missed the point. Of course the range hood has a fan. If you don't have a fan also pushing the air in you don't have True MUA, only passive relief when a negative pressure is pulled on the home. Look at any commercial, process exhaust (car-mon, paint booth, commercial kitchen, dust collectors, etc...) they invariably have a POWERED MUA fan providing the offsetting air.
@@mysunnyjim This product is not designed for commercial spaces but can be installed with a powered fan and/or fed into the air handler to use the blower. The kit does not come with a powered fan.
@@mysunnyjim I'm an architect trying to make sense of the "V"... If 400-cfm is being removed through an 8" diameter duct, and the passive make-up hole size needs to be 16" diameter (or a 14"x14" square hole), then passive seems to be a decent tradeoff. But there is a threshold where forced air becomes more practical, as you are stressing above. This is how the 2020 Florida Mechanical Code reads -- look at the exceptions: *_505.2 Makeup air required._* _Exhaust hood systems capable of exhausting in excess of 400 cfm (0.19 m3/s) shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system._ _Exception: In a single-family dwelling, makeup air is not required for range hood exhaust systems capable of exhausting:_ _(a)Four hundred cubic feet per minute or less; or_ _(b)More than 400 cubic feet per minute but no more than 800 cubic feet per minute if there are no gravity vent appliances within the conditioned living space of the structure._
Should put your website in the video description.
What is the function of the thermostat that comes in the kit? Is the thermostat required?
Hi Justin, the make up air kit doesn't come with a thermostat. We just use it in the video as an example.
its a inline damper 24v, a door bell transformer and a vacuum switch that is absolutely adjustable and available on amazon. Don't be fooled
It’s 2021 - make these available online! And be transparent with pricing. So frustrating.
I found it for $190.
I'm going to call you, this is interesting.
This is relief air, not makeup air. Unless you add a fan powering this setup you will always have to have negative pressure in the house for it to “work”. It merely relieves PART of the air being drawn out of the structure. Even Broan tells you to install multiples of these to “comply” with code. No active fan? No makeup air. Bad information in an already poorly understood segment of the market (the V in HVAC). Every home performance expert will tell you the same. The size of a passive hole you need for any decent sized exhaust hood is HUGE.
The product is designed to be installed on a range hood, which always has a fan. See the product manual for clarity. www.iohvaccontrols.com/images/file.php?file_id=16255
@@iohvaccontrols522 You missed the point. Of course the range hood has a fan. If you don't have a fan also pushing the air in you don't have True MUA, only passive relief when a negative pressure is pulled on the home. Look at any commercial, process exhaust (car-mon, paint booth, commercial kitchen, dust collectors, etc...) they invariably have a POWERED MUA fan providing the offsetting air.
@@mysunnyjim This product is not designed for commercial spaces but can be installed with a powered fan and/or fed into the air handler to use the blower. The kit does not come with a powered fan.
@@mysunnyjim I'm an architect trying to make sense of the "V"...
If 400-cfm is being removed through an 8" diameter duct, and the passive make-up hole size needs to be 16" diameter (or a 14"x14" square hole), then passive seems to be a decent tradeoff. But there is a threshold where forced air becomes more practical, as you are stressing above.
This is how the 2020 Florida Mechanical Code reads -- look at the exceptions:
*_505.2 Makeup air required._*
_Exhaust hood systems capable of exhausting in excess of 400 cfm (0.19 m3/s) shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system._
_Exception: In a single-family dwelling, makeup air is not required for range hood exhaust systems capable of exhausting:_
_(a)Four hundred cubic feet per minute or less; or_
_(b)More than 400 cubic feet per minute but no more than 800 cubic feet per minute if there are no gravity vent appliances within the conditioned living space of the structure._