- Used principally for fitting in a masonry wall
- Material : Anti-corrosion treated sheet steel
Capacity Chart for Exhaust Air Valve – OPF 80
Capacity Chart for Exhaust Air Valve – OPF 100
Capacity Chart for Exhaust Air Valve – OPF 125 & 125K
Capacity Chart for Exhaust Air Valve – OPF 150 & OPF 160
Capacity Chart for Exhaust Air Valve – OPK 100 & 100K
Capacity Chart for Exhaust Air Valve – OPK 160 & 160K
Capacity Chart for Exhaust Air Valve – OPK 200df
Capacity Chart for Supply Air Valve – OPT63
Capacity Chart for Supply Air Valve – OPT100E
Capacity Chart for Supply Air Valve – OPT125
Capacity Chart for Supply Air Valve – OPT150 & OPT160
Capacity Chart for Supply Air Valve – OPT200
Capacity Chart for Supply Air Valve – OPTS 100E
Capacity Chart for Supply Air Valve – OPTR 100
Capacity Table – OPG 41
