<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:12pt;color:#000000;"><DIV>I recently decided against using a spot ERV for a 5 room, 1200' sq cottage (radiant heat) because the local wind pressures and stack effects make the pressure drives on the exterior just too overwhelming for a light weight, low-CFM, ERV. If your heat recovery and air exchange are not from a central system (i.e. powerful enough to take over the buildings climate, including ducting to all rooms), its unlikely a small ERV will be able to overcome the external environmental forces on the building your describing (i.e small apartments or condos).</DIV>
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<DIV>A normal kitchen exhaust (if its externally vented and not just an internal filter - has 400 to 1000 CFM) and your bathroom exhaust (120+ CFM) are more (locally) powerful than a full sized, let alone a spot ERV and probably perfectly adequate to meet all the air exchange needs in small and medium sized living units. Timer controlled fresh air supply might be needed to complement/supplement the exhaust of a timed bathroom exhaust and during the cooking cycles of the kitchen exhaust. Your under-door fresh air supply (allegedly fresh air) will defeat the spot HRV's performance (its not just a question of volume of air per minute, its the flow rate and pressures).</DIV>
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<DIV>If you live in a apt/condo, under-the-door positive pressure from the hallway brings is ugly. Give me independent air such as the trickle-vent or a coordinated (with exhaust) timed fresh air supply any day over the stale smells and particulates of fried fish, cigarettes, cat hair and marijuana smoke from the neighbours. </DIV>
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<DIV>I bet there are half a dozen other things you can do per unit for the same price (investment) as the spot ERV that will more constructively affect living climate, improve the air quality, and conserve/recycle/reduce energy waste. </DIV>
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<DIV>TW</DIV>
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