Laserfiche WebLink
TABLE 501.4.1 <br /> PROCEDURE TO DETERMINE MAKEUP AIR QUANTITY FOR EXHAUST EQUIPMENT IN DWELLINGS <br /> Use the Appropriate Column to Estimate Nouse infiltration <br /> One or multiple power One or multiple One atmospherically Multiple atmospherically <br /> vent or direct vent fan-assisted appliances vented gas or oil vented gas or oil <br /> appliones or no and power vent or direct appliance or one appliances or solid <br /> combustion appliances" vent appliances° solid fuel appliiancec lull appliances <br /> t.a)pressure factor <br /> ( 0.15 0.09 0.06 0.03 <br /> b)conditioned <br /> floor area(sf) s <br /> (including unfinished basements) <br /> Estimated House Infiltration(cfm): <br /> (lax lb) S3ct <br /> 2. Exhaust Capacity <br /> a)continuous exhaust-only <br /> ventilation system(chm): <br /> (not applicable to balanced <br /> ventilation systems such as HRV) <br /> b)clothes dryer(dm) 135 135 t35 135 <br /> c)80%of largest exhaust rating �UCJ <br /> (�): �+ <br /> (not applicable if recirculating 1 i <br /> system or if powered makeup air , , — <br /> is electrically interlocked and LI G <br /> matched to exhaust) D <br /> d)80%of next largest exhaust <br /> rating(cfm): <br /> (not applicable if recirculating <br /> system or if powered makeup err <br /> is electrically interlocked and <br /> matched to exhaust) riot applicable . <br /> Total Exhaust Capacity(cfm): nn <br /> (2a+2b+2c+2d1 '( 3 <br /> 3. Makeup Air Requirement <br /> a)total exhaust capacity l'3":; <br /> (from above) - <br /> b)estimated house infiltration7 q <br /> (from above) �.) l <br /> Makeup Air Quantity(cfm): <br /> 13a-3b) <br /> (if value is negative.no makeup <br /> air iS needed) <br /> 4. For Makeup Air Opening Sizing, <br /> refer to Table 501,4.2 0+)N <br /> A Use this column if there are other than fan-assisted or atmospherically vented gas or od appliances or if there are no combustion appliances. <br /> s Use this column if there is one fan-assisted appliance per venting system.Other than atmospherically vented appliances may also be included. <br /> c Use this column if there is one atmospherically vented(other than fan-assisted)gas or oil appliance per venting system or one solid fuel appliance. <br /> 3 Use this column if there are multiple atmospherically vented gas or ort appy using a common vent or if there are atmospherically vented gas or <br /> oil appliances and solid fuel appliances. <br /> 1346- 15 <br />