Without disrupting passive indoor ventilation, this backflow preventer will prevent backflow from your ventilation system. It is made of ABS plastic and the membrane is made of a special lightweight polymer.
-20% | £1.98 |
-15% | £2.11 |
-10% | £2.23 |
-7.5% | £2.29 |
-5% | £2.36 |
Without disrupting passive indoor ventilation, this backflow preventer prevents backflow from your ventilation system. It is made of ABS plastic and the membrane is made of a special lightweight polymer.
The backflow preventer is mounted on a fan with special fasteners provided on the fan spindle.
D: 125mm
a: 14mm