Build Daily

Engineering Systems

August 12, 2017 18:07

Local ventilation - pure light your home

When local ventilation is needed?

Local ventilation in the house is always needed, as in any home space and have separate areas where the content of harmful gases and moisture is much higher than health standards.If there is built-in garage, it is clear that here in the first place should be forced to hood on the ground floor of the cottage.Otherwise toxic exhaust gases will enter the car in the premises, not only through the door, but also by the slow diffusion through the walls and ceiling.

Equally important is a local ventilation in the kitchen.Here in the atmosphere affect just four negative factors: carbon dioxide and carbon monoxide from the plate, high temperature, moisture and odors.If you do not make a good hood over the stove, headache and insomnia hostess and the home will be provided.

Bathroom - another home object, which requires a local installation of the forced ventilation.Natural ventilation can not do enough dry air here, from which suffers not only health, but also the appearance of the finish.Fungus and mold do not decorate no joints in the tile or ceiling.

If the toilet is separate from the bathroom, a good extractor it is vital.Small amount of space required multiple air.

Design features of local exhaust ventilation

Local exhaust ventilation in its concept consists of an air inlet, fan and vent channel.The shape of the intake device depends on the purpose of drawing.Thus, for gas cookers it has an umbrella shape and is located at a distance of not more than 70-80 cm above the work surface.The width of the kitchen hood must be at 8-10 cm more than the width of the plate, in order to fully collect all the products of combustion.

for bathroom and toilet air intake is performed in the form of a round or square grille with louvers and is mounted directly in the false ceiling or adjacent to existing ventilation shaft.

The budget versions of local ventilation are commonly used electric fans axial channel type.They are easily adapted to the duct system and can be equipped with monitoring devices work duration.For example, in the toilet such a sensor will switch off the fan immediately after turning off the light, and with a delay of a few minutes, he managed to upload the premises fresh air.

More complex systems that require payment of local ventilation, operate centrally.They have one common powerful fan that serves multiple air inlets located in the garage, bathroom, kitchen and toilet.

Calculating ventilation

Regardless of local ventilation in your house, for its normal operation requires a special account.Its aim is the selection of the performance of air handling units.

To calculate this value, you need to know:

  • amount of space;
  • normative air exchange;
  • power factor of safety of local hoods.

room volume is calculated by multiplying its area by the height.The standard number of air - the value that determines the number of complete change all the air in the room for an hour.It is taken from the building standards for ventilation and air-conditioning.

will show the calculation of local ventilation with a simple example.For the kitchen, equipped with a gas stove, the norm requires twelvefold breathability.Let her area will be equal to 8 square meters with a height of 3 meters.8 Multiply by 3 and the multiplicity of 12. Get the 288. That is, one hour in the kitchen should arrive and be removed the air extractor in the amount of not less than 288 m3.

Accordingly, choosing the ventilation system, this focus on performance, not forgetting the reserve ratio of 1.3.As a result, we get 288h1,3 = 374.4 m3 / h .

for bathroom and toilet standard ventilation rate is from 7 to 9. In the garage, the figure should be in the range of 4 to 8, and in the cellar at 4-6.