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GENERAL REGULATIONS <br /> ance of 3 inches(76 mm)along the sides,back and top with a 306.2 Appliances in rooms. Rooms containing appliances <br /> total width of the enclosing space being atlleast <br /> provided and <br /> an unobstructed <br /> mm)wider than the furnace.Furnaces having fibox open to meas5 shall brie g not than 36 inches(914 mm)wide passagewayd 80 inches <br /> 32 mm)high. <br /> the atmosphere shall have at least 6 inches(152 rnm)working (20Ex Exception:Within a dwelling unit,appliances installed in a <br /> space along the front combustion chamber side. Combustion <br /> air openings at the rear or side of the compartment shall corn- compartment, alcove, basement or similar space shall be <br /> ply with the requirements of Chapter 7. accessed by an opening or door and an unobstructed pas- <br /> Exception: This section shall not apply to replacement sageway measuring not less than 24 inches(610 mm)wide <br /> and large enough to allow removal of the largest appliance <br /> appliances installed in existing compartments and alcoves in the s ace,provided that a level service space of not less <br /> where the working space clearances are in accordance with p <br /> the equipment or appliance manufacturer's installation than 30 inches(762 mm)deep and the height of the appli- <br /> instructions. ance,but not less than 30 inches(762 mm),is present at the <br /> front or service side of the appliance with the door open. <br /> ❖Access opening passageway are <br /> :•alcoves <br /> furnaces ha teat are installedesfromin thecompartments <br /> enclosure or specifiedssto afford andpapersonnelwaYdimensionsac- <br /> thatpaired <br /> the count havee clearances ed, the enclosure or and service allow forthereasonablesonsys- <br /> airrfurnace can bh r 7 re, l ass om os re- cess to appliancesliances, sure os fur- <br /> duas and openin sfor Chapterre 7 movementen combustion tern components. Quite often app <br /> ducts openings for free of air. nates, boilers and water heaters are installed in <br /> The minimum clearances specified in the code ap- spaces with little or no forethought about future access <br /> ply even though the manufacturer's instructions might for or replacement. <br /> permit a lesser clearance. Clearances provide access, maintenancein oar <br /> repcs.acecs containing appliances shall <br /> ventilation cooling of the appliance and equipment and 306.3 Appliances <br /> eway <br /> protection enc helps <br /> protect combustibles <br /> ombust blesles.The ront agafire be nst largerovided with an opening enough to allow removal of thelarg sttappliance. The <br /> box)m oarance d fc <br /> flame roll-out and allows free movement of combus- passageway shall not be less than 30 inches(762 mm)high an <br /> d <br /> tion air. The exception exempts replacement appli- 22 inches(559 mm)wide and not more than 20 feet(6096 mm) <br /> in length measured along the centerline of the passageway <br /> antes and equipment installed in existing compart- g <br /> ments or alcoves if the installation complieswith the from he op sn ng toohe a notpplia lees thepassageway icshat have <br /> mmm) <br /> anufacturer's instructions. <br /> COPPER AND �i1fi THICK <br /> PLASTIC PIPING\ SHIELD PLATE <br /> WALL ASSEMBLY TOP PLATE I----- - -- -- '- .--1---- <br /> i <br /> , , <br /> , , <br /> 2"MIN. <br /> . <br /> ,� <br /> 0 <br /> AA <br /> _, <br /> PIPING IS LESS <br /> THAN 1W <br /> FROM EDGE OF <br /> STUD <br /> "<--- STUD <br /> For SI: 1 inch=25.4 mm. <br /> 1 Figure 305.5 <br /> I PIPE PROTECTION <br /> 2009 INTERNATIONAL MECHANICAL CODE®COMMENTARY <br />