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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 cfm . 15 cfin duct with three 90°elbows and a screened hood 4 inches 90 cfm 60 cfin 30 cfm , b) Equivalent designs calculated using pressures of 50 Pascals 5 inches 140 cfm 100 cfm 45 cfm for Path 0, 25 Pascals for Path 1, and 5 Pascals for Path 2 6 inches 200 cfm .140 cnn 65 cfm may be used. 7 inches 270 cfm 190 cfm 85 cfin c) If a make-up air opening is used with no duct or elbows,the 8 inches 350 cfm 250 cfm 110 cfin diameter can be decreased by 1 inch. 9 inches 450 cfm 320 cfm 140 cfm d) If flex duct is used,increase diameter by 1 inch. 10 inches 570 cfin_ 400 cfm 180 cfin Make-up Air Application/Location CFM Opening size Duct Type - ❑ Smooth ❑ Flex ❑ Opening only ❑ Smooth ❑ Flex ❑ Opening only ❑ Smooth ❑ Flex ❑ Opening only ❑ Smooth ❑Flex ❑ Opening only AGGREGATE MAKE-UP AIR WORKSHEET INSTRUCTIONS • Step 1. Complete Exhaust Schedule on the right indicating cfm of largest device in each category. EXHAUST SCHEDULE 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 dryer. 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. Other exhaust Step 5. Fill out the Passive Make-up Air Opening Schedule above. -TOTAL U Path 0 — Aggregate Make-up Air Method Passive Passive Powered Infiltration Opening Make-up Passive infiltration for up to 425 cfm Passive openings for cfms over 425 Powered to match flow for cfrns over 985 ❑ Path 1 — Aggregate Make-up Air Method Passive Passive Powered Infiltration Opening* Make-up Passive infiltration up to 175 cfm* Passive openings for cfms over 175 Powered to match flow for cfms over 565 * If a closed controlled solid-fuel burning appliance 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. U Path 2 — Aggregate Make-up Air Method Passive Passive Powered Infiltration Opening Make-up 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 Infiltration Opening Make-up Powered to match flow N/A N/A 16