The kitchen is often the focal point of the home. Itís the place where we cook,wash, eat and often entertain. Itís also a source of heat, steam, and odours. Cooking smells can wet appetite, but unchecked they drift and linger throughout the house. Condensation can damage furnishings and too much heat can be a real problem in modern well insulated dwellings.
Properly ventilated, the kitchen can remain a fresh environment in which to work and live.
Utility rooms are often a mix of heat from laundry equipment and VOCís from cleaning materials. They are subject to a variety of uses from clothes drying to washing the dog! Ventilation effectively extracts this water vapour and odours.
For installations that fall within the scope of Building Regulations, the unit ventilation extract requirements are Kitchens 60l/s (30l/s with a cooker hood) and Utility rooms 30l/s. If the room does not have an opening window, then a fan with a built in timer should be selected.This will continue to run for at least 15minutes after the room has been vacated.
Older properties present a different challenge. With generally larger rooms, higher ceilings but poorer insulation, the effects of condensation are often more obvious. Here, a better method of selecting a fan is based on room volume multiplied by air change.
- Domestic kitchens 15-20 ach
- Utility rooms 15-20 ach
For kitchen canopies a speed selectable model with a high speed of over 450m3/h is often necessary to capture the heat and steam from a hob with four pans. For island installations this extract figure needs to be doubled.
The extract point should always be positioned to capture water vapour andodours at source. With the exception of kitchen canopies, it should be located as high as possible and provide a flow across the room with air replacement usually coming from the doorway.
Axial fans are suitable for through the wallor window fitting in most homes. For highrise and exposed (e.g. coastal) locations, centrifugal fans will cope better with gusty conditions. Centrifugal and mixed flow units have a better pressure characteristic, which makes them more suitable where aducted solution is required.
If there is a fuel burning appliance in the room, ensure that there is adequate air replacement for both the fuel burning appliance and the fan.
In a kitchen, the right position will usually be an external wall or a window, but keep away from direct heat sources over 40ļC, such as an eye level grill.
And donít forget the fan needs to be accessible for regular cleaning. Ventilation, working effectively, will pick airborne particles, which would otherwise deposit to your dťcor.