FLEXIT 112743112748 External Louvre with Hood Installation Guide
- June 12, 2024
- FLEXIT
Table of Contents
113022-05
2022-05
External louvre with hood
Installation instructions
ART.NR.:
112743-
112748
112975
115379-
115382
DESCRIPTION
AREA OF USE
External louvre with hood for exhaust and outdoor air in protected and
normally exposed areas. Protects the venti-lation duct from weather
conditions.
Connected to circular ducts with diameter 125-250mm.
TEST PROCEDURE
The measurements are made at SP according to:
• ISO 5135:
Acoustics – Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation room
• SS-EN 13141-2:
2010 Ventilation for buildings – Performance testing of components/products for residential ventilation – Part 2: Exhaust and supply air terminal devices
- Free area: Open surface where the air can pass into the product.
QUICK GUIDE SIZE / AIR FLOW
SOUND DATA
Sound power level
CAPACITY DIAGRAM
MATERIAL
External louvre consists of a back part and a front casing.
Produced in recoated steel plate.
The back part is equipped with a mesh which protects from small animals and has a circular connector in hot-dipped galvanised plate with approved rubber ring seal.
Precoated steel plate:
• Good color retention
• Conforms corrosively C4
• Low environmental impact during production
• 100% recyclable
Material: Hot-dipped galvanization of steel plate according to SS-EN10142 with zincweightclass Z530. Zinclayer of 275pm coated with 25pm thicklayered polyester colour in white or black.
Colour:
• Black, 015, NCS S 9000-N, RAL 9005 Glans 30-46
• White, 001, NCS S 1002-G50Y, RAL 9002 Glans 30-46
DIMENSIONS
Black Art.nr
| White Art.nr| Art.nr| SIZE D| A mm| B mm|
C mm
---|---|---|---|---|---|---
112743
| 112744| 115379| 125| 270| 105|
245
112745
| 112746| 115380| 160| 300| 130| 300
112747
| 112748| 115381| 200| 400| 140|
345
112975| —| 115382| 250| 525| 215|
505
GENERAL
Low speed over the free area is essential for a satisfying function.
Usually the louvres noise generation is less than the fan noise and does not cause sound problems.
There is a connection between high velocity and high pressure drop that gives energy loss. Always strive solutions with as low velocity/pressure drop as possible with respect to withdraw of moisture (for outdoor air). This gives lower soundlevels and a better economy in operation. Exhaust should be installed in such a way that you achieve higher air velocity/pressure drop to give a better throw out effect away from the building.
It can not be excluded that aerosols, frost smoke, light snow or ice dragged with the air under adverse conditions. When fans are switched off, condensation can be a problem, the ventilation should therefore never be shut off. But if that is the case the ducts should be fitted with an air damper for closing.
Important to take into account when safe design of louvres for exhaust/outdoor air:
- External wind influence
- Air velocity -free area/airflow
- No objects that can interfere with the air flow
- Temperature influence example heat or freezing
- Energy loss / pressure drop
- External noise requirements
- Protection against small animals
- Access for cleaning and maintenance purposes
INSTALLATION
WHAT’S INCLUDED?
Front Cover
Back panel
DIAGRAM-INSTALLATION
Example for wood facade
Example for concrete and outer brick wall
BEFORE INSTALLATION
The product installed on exterior walls. Adjust the position by studs and ducts.
If both the outdoor air and exhaust mounted on the same wall, caps mounted with min. 120 cm distance.
It is also important that the ducts is fitted with a fall against the outdoorwall so that the driving rain that still could come in, it will run out.
Height above ground level should be min. 2 meters.
Avoid placing the inner corner and avoid nearby objects that may interfere with airflow. There should be several feet in front of the stand.
MOUNTING
Loosen the fastening screw
Pull down the front cover
Make a hole in the wall and pull out the steel duct so that the duct finishes aligned with the facade. Seal holes in the wall carefully.
Steel duct equipped with rubber band. Connect to outdoor air or exhaust air duct.
Fasten to the facade with proper fastening-material.
Back panel is fastened against the wall. Holes 0 5mm.
Place the front cover back in place and fasten the screw.
The top edge seals against the facade.
NB! Screws for fixing against the facade is not supplied.
Sealing against wind barrier is made from inside.
Pull the sleeve onto the duct and secure to the wind barrier from the inside using sealing tape. If the wall is insulated and has a vapour barrier on the inside, seal with the vapour barrier from the inside in the same way using a similar sleeve. Use pre-insulated ducts with cellular rubber for the wall bushing, and sealing sleeves one size larger that fit over the insulation. The wall bushing can then be finished off and sealed before installation continues with longer ducts. If you continue into the room using ducts insulated with an insulating sleeve, the sleeve must be well over the cellular rubber before the plastic film is taped to the cellular rubber.
MAINTENANCE
There should regularly be carried out cleaning of the product to avoid that leaves and dirt occlude the air inlet and outlet.
If the external louvre is used for outdoor air it might be needed to brush off frost, in times of snow smoke/fog. To avoid these problems we can recommend a solution with installation of heating cables.
This is an accessory which isn’t a part of Flexits assortment. Contact your local electrician.
Check a couple of times a year, or more often if needed.
Flexit AS,
Televeien 15,
N-1870 Orje