HAC-MBD
Manual Balance Damper
Set-and-Lock Airflow Balancing · No Power · 4"–20"
- ✓Set blade restriction at commissioning — lock it, walk away
- ✓Locking mechanism holds against duct vibration and airstream pressure
- ✓No motor, no wiring, no controls — nothing to fail
- ✓Suitable for fresh air intake and low-temperature exhaust air
- ✓Sizes 4"–20" including odd-inch — 10-year mechanical warranty
- ✓Can be readjusted if system conditions change
What It Does
The HAC-MBD is a manual inline balancing damper for HVAC duct systems where airflow needs to be set at commissioning and held there permanently. Position the blade to the desired restriction, lock it with the adjustable locking mechanism, and the system stays balanced. No motors, no wiring, no controls — nothing will go wrong with it. A manual balance damper set and locked at commissioning will still be in exactly that position ten years later.
The most common application is fresh air intake flow limiting — setting a maximum fresh air volume to the code-required or design rate and locking it there. HRV and ERV balancing is the other primary application — trimming the higher-flow branch to match the lower flow so heat recovery works correctly and building pressure neutrality is maintained.
Part Numbers — Diameter Is the Only Selection
| Size | Part Number | Size | Part Number |
|---|---|---|---|
| 4" | HAC-0400-MBD | 10" | HAC-1000-MBD |
| 5" | HAC-0500-MBD | 12" | HAC-1200-MBD |
| 6" | HAC-0600-MBD | 14" | HAC-1400-MBD |
| 7" | HAC-0700-MBD | 16" | HAC-1600-MBD |
| 8" | HAC-0800-MBD | 18" | HAC-1800-MBD |
| — | — | 20" | HAC-2000-MBD |