Fau located in an attic attic access service space c m c 904 crc r807 ventilation.
Attic furnace detail.
Unvented cathedralized attic detail with air impermeable insulating sheathing installed over the roof deck.
Fau unit shall be doubled with a minimum 2x6 joists.
Attic hvac systems save space.
Attic furnace access passageway and platform attic furnace passageway and.
This handout is intended to provide only general information for further information contact the building safety division.
Attic furnace walkway platform attic furnace installation must comply with you local mechanical code or imc international mechanical code if such was adopted in your area.
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A 30x22x30 inch high minimum unobstructed access but not less than the largest equipment size.
Located in an attic cmc 304 4 furnaces located in an attic area shall comply with the diagram at the bottom of this page.
Additionally if the attic and roof is conventionally framed ceiling joist under the location of the fau unit shall be doubled with a minimum 2x6 joists.
Sediment trap cpc 1212 8.
Refer to the current state and local building codes for the minimum r value of air impermeable insulation required for the roof assemblies in your climate.
Obtain the furnace manufacturers installation instructions and install the furnace to their specifications.
So why put an hvac system up in the attic at all.
Attic furnace 2019 california mechanical code sections 904 10 through 904 10 the following are general requirements for an attic furnace based on the 2019 ca mechanical code.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.
B 30x30 inch minimum unobstructed passage to remove equipment but not less than the largest equipment maximum 20 distance from access to unit.
How to install insulating sheathing over the roof deck with a cathedral ceiling.
Attic access may be reduced to 22 x 30 provided the.
If the attic and roof framing is a pre fabricated engineered truss system an engineering report wet stamped and signed by a licensed engineer shall be submitted for review and approval prior to issuance of a building permit.
Establish the best location for installation of forced air unit and vent.
Cmc chapter 9 attic furnace diagram.
An attic in which a fau is installed shall be accessible by an opening and passageway 30 x 30 in size.