| Function: |
| ROOF
FINISH |
SOIL
AND VENT |
MECHANICAL |
NATURAL |
AIR
INTAKE |
| Felt |
OFT/1F |
OFT/1F |
OFT/1F |
OFT/1F |
| |
|
OFT/4 |
OFT/4 |
|
| Asphalt |
OFT/1A |
OFT/1A |
OFT/1A |
OFT/1A |
| |
|
OFT/4 |
OFT/4 |
|
|
| Free
Vent Area: |
110
Ø = 8400mm²
131 Ø = 12000mm²
166 Ø = 20000mm² |
| Roof
Finish: |
Built-up
Felt (coded Suffix F).
Asphalt (coded Suffix A).
OFT/4 is for use with both felt and asphalt |
| Colour: |
Black. |
| Components: |
|
Code
|
Diameter
(mm)
|
Height
Above Roof (mm)
|
Flange
Diameter (mm)
|
Depth
Below Flange (mm)
|
|
OFT/1F
|
110
|
250
|
330
|
350
|
|
|
166
|
300
|
363
|
350
|
|
OFT/1A
|
110
|
300
|
395
|
350
|
|
|
131
|
300
|
450
|
350
|
|
|
166
|
300
|
450
|
350
|
|
OFT/4
|
110
|
300
|
395
|
350
|
|
|
131
|
400
|
450
|
350
|
|
|
166
|
540
|
450
|
510
|
|
| Features: |
OFT/1
– Soil and vent pipe terminals with removable cap for external
pressure testing. 110mm Ø also suitable for terminating domestic
fans and for natural ventilation.
OFT/4 – Double-walled unit for mechanical extract & natural
ventilation to minimise risk of condensation. |
| Pressure
/ Airflow Resistance: |
|
Diameter |
OFT/1F
Readings
taken at 100m³/h. |
OFT/1A
Readings taken at 100m³/h. |
OFT/4
Readings
taken at 225m³/h. |
| 110
Ø = |
5.9
Pa |
1.5
Pa |
<
1.0 Pa |
| 131
Ø = |
|
1.1
Pa |
<
1.0 Pa |
| 166
Ø = |
2.5
Pa |
1.0
Pa |
<
1.0 Pa |
|
|
Pack Information:
|
|
|