Hoval RoofVent CON-9, Design Handbook

Page: 270 / 280

300
H
A
A
≥
20
0
20
0
J
30
30
Access panel
Extract air grille
For dimensions H and J, see 'Technical data' section of
the respective unit type
Sealing strip (fitted at the factory)
Sealing on the roof frame (to be effected by the installer,
e.g. using silicone)
Weathering skirt of the roof unit
Roof frame
Fig. M3: Installation of the RoofVent
®
units in the roof frame (dimensions in mm)
1 Roof frame
Roof frames are required for installing RoofVent
®
units in the
roof. Please consider the following in the design process:
■ The access panel and extract air grille must be freely
accessible under the roof.
■ The roof frame must protrude at least 200 mm from the
roof, so that no water can penetrate during a rainstorm or
snowfall.
Note
If none of the three standard filter box lengths ( F00,
F25, F50 ) meets these requirements, the filter box is
also available in special lengths.
■ The opening (dimension U) must be large enough to
accommodate the below-roof unit.
■ The outside dimension (dimension T) must be just large
enough to ensure that the weathering skirt of the roof unit
still covers the roof frame.
■ The roof frame must be insulated.
■ The roof frame must be flat and horizontal.
■ Please observe the minimum distances when designing
the roof frame (see the 'Technical data' of the respective
unit type). If necessary, change the orientation of the coil
connections.
Depending on local conditions, 2 different types of roof frame
can be used:
■ Roof frame with straight side walls (where there is suffi-
cient space)
■ Roof frame with conical side walls all around (where a
below-roof unit protruding into the room interferes with the
craneways, for example)
≥
500
20°…45
°
Fig. M1: Roof frame with straight side
walls
Fig. M2: Roof frame with conical side
walls
System design
Roof frame