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B| Style | Model | Overall Size | Max. Air Velocity | Rough Opening Length | Rough Opening Width | Overall Width | Overall Height | Rough Opening Dia. | Damper Size | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 4HX64 | 14" x 14" | 2000 FPM | 11 1/2" | 12 1/2" | 14" | 14" | 12 1/2" | 12" x 12" | £56.26 | |
| A | 4HX65 | 17" x 17" | 2000 FPM | 14 1/2" | 15 1/2" | 17" | 17" | 15 1/2" | 15" x 15" | £68.91 | |
| A | 4HX66 | 21" x 21" | 2000 FPM | 18 1/2" | 19 1/2" | 21" | 21" | 19 1/2" | 19" x 19" | £80.18 | |
| B | 4HX67 | 25" x 25" | 2250 FPM | 22 1/2" | 23 1/2" | 25" | 25" | 23 1/2" | 23" x 23" | £110.45 | |
| A | 4HX68 | 29" x 29" | 2250 FPM | 26 1/2" | 27 1/2" | 29" | 29" | 27 1/2" | 27" x 27" | £127.31 | |
| A | 4HX69 | 37" x 37" | 2250 FPM | 34 1/2" | 35 1/2" | 37" | 37" | 35 1/2" | 35" x 35" | £176.91 | |
| A | 4HX70 | 41" x 41" | 2250 FPM | 38 1/2" | 39 1/2" | 41" | 41" | 39 1/2" | 39" x 39" | £222.18 |
Dayton damper roof mounts are isolation dampers or backdraft dampers that provide airflow in one direction and stop reverse airflow. They are ideally used with belt-drive centrifugal roof and wall ventilators. They are provided with felted-edge aluminium louvres, stainless steel pivot pins and nylon bushings. Choose between 2000 and 2250 FPM max. velocity variants of these roof mount dampers, available on Raptor Supplies .