RD + NBR
Available in four dimensions:
RD 18 (opening size 180 × 80 mm)
RD 21 (opening size 200 × 100 mm)
RD 32 (opening size 300 × 200 mm)
RD 43 (opening size 400 × 300 mm)
Only suitable for ducts with a clean and smooth surface without seams.
The reason why the NBR gasket is not offered for all the access door sizes has to do with the necessary pressure needed to make the connection door / airduct oil-tight. Indeed, the knobs of the larger access doors do not provide enough pressure on the NBR gasket along the entire circumference of the opening. As a result the NBR gasket is not sufficiently compressed and an oil-leakage may occur.
Properly installed access doors withstand positive or negative pressures up to at least ≈ 5000 Pa. (≈ 500 mm w.g.). Since the conditions on the construction site are never ideal, and because the quality of the ducts does vary, no definitive guarantees can be given regarding the tightness, especially in the long term.
Max. operating temperature: ≈ + 80°C.
- Duct wall.
- Press formed covers (original METU-Design available in galv. and stainless steel V2A).
- NBR Gasket.
- Sealing rings made of NBR.
- Mushroom head bolts.
- Steel springs.
- Stop-nuts prevent the knobs from being totally removed.
- Ergonomic and corrosion resistant knobs which do not allow the bolts to protrude (protected design).
- Retaining cable with M6 bolt and nut preventing the loss of the door (order separately, art. nr. D01V-2001)
Duct Wall Thicknesses
RD access doors with NBR gasket: S1 = max. 5 mm
For thicker duct wall thickness special access door versions with longer bolts can be ordered.
