HVAC Airflow / Room CFM Verification Checklist PDF

Full QC Checklist+

Verify the load basis, equipment airflow, room allocation, duct design, balancing, and final measured HVAC airflow.

✓20 Inspection Points

✓4 Verification Categories

✓Inputs & Mode Selection+

Correct calculation mode selected for the actual question being answered (sensible load, equipment tonnage, or room allocation)
Sensible load entered in Sensible mode — not total (sensible + latent) cooling load
Temperature difference (ΔT) entered as the actual intended design split, not guessed or left at the default
Equipment tonnage confirmed against the actual nameplate or spec sheet in Equipment mode, not guessed from square footage
Airflow-per-ton selection justified by climate and manufacturer data, not left at whatever the tool defaults to

✓Load & Airflow Basis Consistency+

Room and system loads (in Room Allocation mode) come from the same load calculation, not two different sources or software runs
System design airflow (in Room Allocation mode) taken from the selected equipment's actual blower performance data, not guessed
All rooms in the zone entered, or a partial room set is a deliberate choice with the unallocated airflow understood
Selected CFM/ton checked against the 350–450 safe band; manufacturer data obtained before using anything outside it
Latent (moisture) load correctly excluded from every sensible-load input across all three modes

✓Downstream Duct & Register Design+

Each branch duct sized for its own room's design CFM using an accepted duct-sizing method (friction rate, velocity, or equivalent length)
A complete return-air path exists for every room that can be closed off (door, transfer grille, jump duct, or dedicated return)
Supply and return duct velocities checked against acceptable noise and friction limits for the calculated CFM
Register/grille free area sized for its assigned CFM at an acceptable face velocity, not selected by appearance alone
Duct material and insulation level appropriate for the space each run passes through (attic, crawlspace, conditioned space)

✓Measurement & Commissioning+

Total system airflow measured (flow hood, duct traverse, or manufacturer-rated method) and compared against the design target
Each room's actual delivered supply airflow measured and balanced toward its design target, not assumed correct because the duct was installed
Both cooling and heating operating modes tested at their intended airflow or blower speed/control setting
Total external static pressure measured with the system in its final, as-installed operating condition (filters, coil, ductwork all in place)
Any measured airflow shortfall traced to its actual cause (duct restriction, dirty filter, wrong blower tap/speed) before accepting the system

Inspection Notes+

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Inspection Notes

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Use it after collecting the project inputs and again before approving or closing the relevant work stage.

No. It supports verification but does not replace approved drawings, specifications, codes, manufacturer requirements, or professional inspection.