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PASSIVE MAKE-UP AIR OPENING SCHEDULE TABLE FOR SIZING PASSIVE MAKE-UP AIR OPENINGS Diameter Path 0 Path 1 Path 2 Notes: a) This table assumes 20 feet of smooth unobstructed round 3 inches 50 cfm 35 cfin 15 cfm duct with three 90°elbows and a screened hood 4 inches 90 cfm 60 cfm 30 cfm b) Equivalent designs calculated using pressures of 50 Pascals 5 inches 140 cfm 100 cfin 45 cfm for Path 0, 25 Pascals for Path 1, and 5 Pascals for Path 2 6 inches 200 cfm l40 cfm 65 cfin may be used. 7 inches 270 cfm 190 cfm 85 cfm c) If a make-up air opening is used with no duct or elbows,the 8 inches 350 cfm 250 cfm 110 cfm Diameter can be decreased by 1 inch. 9 inches 450 cfin 320 cfm 140 cfm d if flex duct is used,increase diameter b 1 inch. 10 inches 570 cfin 400 cfm 180 cfm Make-u Air A lication/Location CFM enin size Duct T e ❑ Smooth ❑ Flex ❑O enin onl ❑ Smooth ❑ Flex ❑ enin onl ❑ Smooth ❑ Flex ❑ enin onl ❑ Smooth ❑Flex ❑ enin onl AGGREGATE MAI�E-UP AIR WORKSHEET INSTRUCfIONS Step 1. Complete Exhaust Schedule on the right indicating cfrn of largest device in each category. EXj-jAUST SCH�'DULE Step 2. Complete the Combustion Equipment Schedule on preceding page. DEVICE CFM Step 3. Choose a path with a Y(Yes)for all selected equipment. Clothes d er Step 4. Complete Aggregate Make-up Air table below for chosen path.Using the total cfm from the Kitchen exhaust Exhaust Schedule,indicate flow in cfm for proposed method(s)of providing make-up air. Othet exhaust Step 5. Fill out the Passive Make-up Air Opening Schedule above. TOTAL ❑ Path 0 —Aggregate Make-up Air Method Passive Passive Powered Make-up Infiltration enin Passive infiltration forup to 425 cfm Passive openings for cfms over 425 Powered to match flow for cfms over 985 ❑ Path 1 —Aggregate Make-up Air Method Passive Passive Powered Make-up Infiltration enin * Passive infiltration up to 175 cfin* Passive openings for cfms over 175 Powered to match flow for cfins over 565 * If a closed controlled solid-fuel buming appiiance is installed in Path 1,then a passive opening must be installed to provide make-up air for the clothes dryer and for any central vacuum that exhausts to the outside. ❑ Path 2 —Aggregate Make-up Air Method Passive Passive Powered Infiltration enin Make-u Passive openings for up to 175 cfm Powered to match flow for cfms over 175 N/A ❑ Path 3 — Aggregate Make-up Air Method Passive Passive Powered Infiltracion enin Make-u Powered to match flow N/A N/A 15