Hoval RoofVent CON-9, Design Handbook

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18 Extract air filter in front of the
extract air grille
In applications
■ with heavily contaminated extract air
■ with a high increase in humidity inside the room (> 2 g/kg),
an extract air filter can be fitted on the outside of the unit (in
front of the extract air grille) to protect plate heat exchanger
2 against contamination. It replaces the extract air filter in the
combi box.
The extract air filter in front of the extract air grille consists
of an Aluzinc sheet steel casing with inserted minipleat filter
(class G4 or F5). It is delivered dismantled.
Fig. K5: Dimensions of the extract air filter in front of the extract air grille (in mm)
19 Drop eliminator
Moisture in the extract air can condense in the plate heat
exchanger. In order to ensure that no condensate drips into
the unit even in applications with very moist extract air, a
drop eliminator can be installed. It drains the condensate
onto the roof.
The drop eliminator consists of aluminium fins; it is mounted
in the extract air flow on the air inlet side of plate heat
exchanger 1.
Technical data
The drop eliminator increases the pressure drop; as a result,
the exhaust air flow rate of the unit is approx. 5 % lower.
Fig. K6: Drop eliminator on the air inlet side of the plate heat exchanger
Options
Extract air filter in front of the extract air grille