New HVAC-Northern California

[nealtw]

I see your point. Maybe this is why he wanted me to do the install.

And now we hear about cars left running by mistake.

 

[nealtw]

No, there are thousands of systems with the comfort heat appliance in a residential, in continuous use, parking garages throughout CA.

They are closed systems, taking only combustion air from the garage.

Not fresh air for conditioning.

The make-up air for conditioning is taken via a fresh air duct.

I would think they would be in a closed room, sealing around duct work would be a nightmare.

 

[Chris]

I have never seen a furnace in a garage. Water heater yes but no furnaces but then again I live in California where everything is illegal.

 

[Snoonyb]

I was under the assumption from my inspector that you can not pull any air from the garage because cars run in there and it is pumping poison into you house? I tried to add ac vents to my garage but was not allowed to.

That's correct, because just dumping conditioned air into a space without a return, unbalances the system, so when someone either opens, or leaves open the pedestrian door to the enclosed parking area, the potential exists for contaminated air to be drawn into the conditioned air system.

Taking it a step further, the air duct feeding the garage has a damper so that you are not heating the garage, just cooling it. So with the damper closed, and they are inherently a loose fit, the redirected air flow may cause a slight vacume, drawing air from the garage.

Building codes are designed to protect you, from you.

 

[Snoonyb]

I have never seen a furnace in a garage. Water heater yes but no furnaces but then again I live in California where everything is illegal.

Look in any of the housing developments constructed in O.C, LA CO, VENT, Riverside and San Bernardino since the 90's.

 

[Chris]

Three of my homes fit that area and all have the furnace in the attic. It would make sense to have a furnace in the garage but it would still have to be plumbed to pull air from inside the house and not garage air.

Wouldn't a vent in the garage without a return be the same as a vent in a bedroom with the door shut?

 

[Snoonyb]

Three of my homes fit that area and all have the furnace in the attic. It would make sense to have a furnace in the garage but it would still have to be plumbed to pull air from inside the house and not garage air.

Wouldn't a vent in the garage without a return be the same as a vent in a bedroom with the door shut?

There are a lot of that system as well. Its a lot more difficult to push warm air down and the return ducting needs to be sized for it.

Interior doors are loose fit and allow air flow, where a garage pedestrian door, because of the fire rating of the assembly, is a tight fit, by comparison.