DUCT SIZING WORKSHEET-EXAMPLE 2
Step 1:Calculate Block Load
Heating Load:__________90,000_____ Btuh Cooling Load:_________52,000_____ Btuh
Step 2:Room by Room Load
Room Heating Load (Btuh) Cooling Load (Btuh) Airflow (CFM)* Zone Number
Living Room_ ___________ ____________ ______150___ _______3_____
Dining Room/Foyer ___________ ____________ ______150___ _______3_____
Kitchen/Dinette ___________ ____________ ______200___ _______4_____
Family Room_ ___________ ____________ ______200___ _______4_____
Laundry Room ___________ ____________ ______300___ _______4_____
Master Bedroom/Bathroom ___________ ____________ ______400___ _______1_____
Bedrooms 2-4/Bathroom ___________ ____________ ______500___ _______2_____
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*Highest CFM determined from Heat/Cool Btuh
Step 3: Zone CFM totals
Zone 1 _____400____ CFM Zone 5 _____________CFM
Zone 2 _____500____ CFM Zone 6 _____________CFM
Zone 3 _____300____ CFM Zone 7 _____________CFM
Zone 4 _____700____ CFM Zone 8 _____________CFM
Step 4: Equipment Selection
Indoor Section ____355MAV06100__ Outdoor Section _________598B060__
Heating Capacity/CFM ____95,000/62,000__ __________1320/860__
Cooling Capacity/CFM ____53,000/34,000__ _______2,000/1,200__
Design CFM _____1,200 (low speed A/C)
Step 5: Bypass Determination
System Design CFM * ___1,200____ X 0.60 = _______720____
(Value MUST be less than smallest zone CFM; otherwise Bypass Damper may be required)
* Design CFM can be: Step 1C from above OR if Two Speed/Variable Speed equipment is selected, select low speed CFM value...used 2-speed A/C unit/low CFM=1200CFM
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