Does anyone know if the bathroom fan can be used for the fresh air ventilation for small 2 bedroom apartments (600-800 SF)? We would like to use recirculating range hoods and omit the kitchen exhaust fan.
Two questions or one?
Bathroom fan ducted to exterior?
Recirculating kitchen stove fan requires more maintenance to hold down growth of oders if not cleaned regularily. Source of unit replacement air?
Unit have 50% openable windows? AC?
Bathroom fan is ducted to exterior, most windows will be operable, we're using mini-split AC systems (interior fan/coil, exterior condenser). The question is: what is the easiest way to get the outside air ventilation requirement. I would like to have the bathroom fan on a set-back to 20-30 CFM when the bathroom is not occupied to provide outside air through infiltration. This project is in California. I'm trying to avoid having a separate kitchen exhaust fan.
I'm trying to understand why you want no over stove vent?
It can't be cost much or is it more than 2 stories to the roof?
Undercut door to bathroom (or crack window? most tenants won't crack window) to offset removed air but vent must still terminate outside to rid air of moisture.
recirculating vents are common in multi-story apartments.
The CMC appears to be asking for venting in the kitchen and bathroom. My question is, is there any way around the kitchen venting?
MA, this issue was previously reviewed back in 11'. See IRC, nonvented hoods allowed if room has openable windows to offset airdraw, subject to mfg's instructions.. As previously noted however, use of supposedly self-filtering hoods can lead to oder & grease build up. Not a "best practice".
the exhaust fan solution doesn't make sense to me. it is just exhaust. doesn't california limit air INfiltration? and wouldn't that limit make a pure exhaust solution impractical?
Please reference the California Energy Code section 150(o). It identifes compliance is required with ANSI/ASHRAE Standard 62.2. In clarification of this section the Low Rise Residential Energy Compliance Manual, page 4-56 identifies a minimum 100 cfm range hood or by other mechanical means of ventilation providing 5 air changes per hour. By that identification I would say your kitchen ventilation is required, or of course consideration by the AHJ to consider an appropriate alternative. Hope this helps.
Again, where are you going with this?
1. Trying to save hard and future operational costs?
2. New construction vs alternative methods and means as noted above.
3. In the days before electricity stoves stll had gravity hoods for gas and vents/chimneys for fueled(potbelly/wood) stoves.
4. Open kitchen window during the winter (snow?) for fresh air?
bb - Thanks, helpful.