MECHANICAL Furnaces Appliances

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Wall Furnaces

Clearances
From sidewall--6in. unless listed for less . . . . . . . . . .[2434.1] {304.1,6}
From door swing--12in. . . . . . . . . . . . . . . . . . . . . . .[2434.4] {304.1,6}
Below structural projections, including windows--18in. [2434.3] {303.1}

Installation
Header height per manu. . . . . . . . . . . . . . . . . . . . . .[2434.1] {807.1}
Hold-down plate screwed to header . . . . . . . . . . . . . .[2434.1] {807.1}
Cut top and floor plates flush to stud . . . . . . . . . . . . .[2434.1] {807.2}
No ducts attached to wall furnaces . . . . . . . . . . . . . .[2434.5] {303.1}
Shutoff may be inside wall furnace access panel . . . . .[2434.1] {1211.15}

Flue (Type BW) IRC UMC
BW vent terminate min. 12ft. above bottom of furnace [2426.6.6] {806.3}
Follow manu. requirement for stud-bay depth . . . . . . .[2434.1] {303.1}
Base plate from flue manu. . . . . . . . . . . . . . . . . . . .[2434.1] {807.1}
Spacers from manu. installed to specs . . . . . . . . . . .[2434.1] {807.3}
Metal barrier to perforated or metal lath or bldg paper . .[manu.] {807.3}
Ventilate first ceiling plate above unit, OR . . . . . .F-m12 [manu.] {807.6}
Vent stud bay above furnace within 12in. of ceiling . . . .[manu.] {807.5}
Firestop spacers all ceiling plates after 1st plate F-m12 [manu.] {807.6}
Sleeve into attic 12in. &>2in. below sheathing EXC F-m13 [manu.] {807.5}
Sleeve not req'd if furnace >1 floor below attic . . . . . . .[manu.] {807.5}
Existing building--open one wall side for inspection .[2426.5.5] {807.8}
>No offsets in wall . . . . . . . . . . . . . . . . . . . . . . . . . . .[manu.] {807.9}

Floor Furnaces

Underfloor access min. 22in.x30in.{18in.x24in}. within 20ft. .[1305.1.4] {307.4}
Trap door access must have min. 30in. height . . . . . . . . .[n/a] {307.4}
May not project into habitable space . . . . . . . . . . . .[2435.5,6] {303.1.2}
>6in. to ground (2in. if factory sealed) . . . . . . . . . . . . .[2435.4] {304.8}
12in. to sides, 18in. {30in.} to control side . . . . . . . . .[2435.4] {304.4}
Flat-register type min. 6in. from wall . . . . . . . . . . . . .[2435.2] {304.1,6}
Not in doorway and 12in. from door swing . . . . . . . . .[2435.2] {304.1,6}
Wall-register type min. 6in. to sidewall . . . . . . . . . . . .[2435.2] {304.1,6}
Draperies min. 12in. {projections min. 5ft. above} . . . .[2435.2] {304.1,6}

Appliances

General
Install appliances to manufacturer instructions[1307.1,2408.1] {303.1}
Heat source each habitable room . . . . . . . . . . . . . . .[303.6] {UBC310.11}
Fans (bath) min. 3ft. from building openings or PL T-m2 [302.2] {504.6}

Clothes Dryer
Connectors flex. [must be metal] max. 8ft. {6ft.} [1501.1,2437.5] {504.3X}
Connector not concealed in construction . . . .[1501.1,2437.5] {504.3.X}
Duct must be smooth metal inside . . . . . . . .[1501.1,2437.5] {504.3}
No screws in airflow . . . . . . . . . . . . . . . . . .[1501.1,2437.3] {504.3.1}
4in. min. duct [elec. = appliance outlet size] [1501.2,2437.5] {908.1}
{14ft. inc. two 90° bends minus 2ft. per add'l. 90°} . . . .[n/a] {504.3.2}
[25ft. minus 22 ft. per 45° bend or 5ft. per 90°] . .[1501.3,2437.5.1] {n/a}
No mixing with or passage through other systems . .[1501.1,2437.3] {504.3.1}
End outside in backdraft damper & no screens[1501.1,2437.3] {504.3.1}

Range
Vert.clearance to combustibles 30in. . . . . . . . . . . . .[1901.1] {906.1}
{Vert. clearance 24in. to 28ga. metal over 2in. millboard} [n/a] {906.1}
Reduced clearance OK per manufacturer labeling . . . .[1901.1] {906.3}
Gas connector max. 6ft. . . . . . . . . . . . . . . . . . . .[2421.1.2] {UPC1212X1}
Gas valve immediately ahead of connector . . . . . . .[2421.1.2] {UPC1212X3}

Range Hood Ducts
Terminate outside min. 3ft. from opening or PL . . . . . .T-m2 [302.2,1502.1] {504.2,6}
Smooth interior, metal . . . . . . . . . . . . . . . . . . . . . .[1502.1] {504.2}
Backdraft damper req'd. . . . . . . . . . . . . . . . . . . . . .[1502.1] {504.2}

Freestanding Room Heaters
Secure to floor . . . . . . . . . . . . . . . . . . . . . . . . . . .[1307.2] {308.1}
Vented heater min. 12in. to door swing (36in. below projection) . .[manu.] {304.6}
Flame safeguard (pilot safety) req'd . . . . . . . . . . . . .[2444.1] {311.3}
[Unvented heater not sole heat source] . . . . . . . . . .[2443.2] {Ø, 303.1.1}

Fireplace with Gas Appliance
Penetration sealed with listed material . . . . . . . . . . .[2431.1] {901.3}
Factory-built chimney req's spark arrester . . . . . . . . .[1002.1] {812.1}
Damper blocked open . . . . . . . . . . . . . . . . . . . . . . .[1004.4] {901.2}
Req'd valve <=6 ft. {4ft.} of fireplace and in same room
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [2419.5] {UPC1211.14}
Decorative logs with pilots must have pilot safety . . .[2431.2] {901.2.4}

Air Conditioning
Evaporator downstream of furnace . . . . . . . . . . . . . .[1411.2] {304.1}
Working space min. 30in. x 30in. . . . . . . . . . . . . . .[1305.1] {307.2}
Condensate may not drain to public way . . . . . . . . . .[1411.3] {309.3}
Condensate drain min. win. with 8in./ft. slope . . . . . . .[n/a] {309.3}
May drain to indirect receptor (lav. tailpiece, tub overflow) [n/a] {309.3}
Secondary drain and pan req'd for equip. above framing . . .[1411.3.1] {303.1}

Final

Heat source each habitable room . . . . . . . . . . . . . . .[303.6] {UBC310.11}
Equipment listed and installations instructions on site [1401.1] {302.1}
Packing materials removed . . . . . . . . . . . . . . . . . . .[1401.1] {303.1}
Vent caps and flashings in place . . . . . .[1804.2.1, 2426.6.5] {806.1}
Equip installed outdoors approved for such or in weatherproof enclosure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [2406.3] {304.3}

Books based on 2006 IRC, UMC, & UPC; 2005 & 2008 NEC; 2007 CBC, CPC, CMC & CEC with references to changes from prior editions. Books are published by The Taunton Press Inc.
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