Systemair fans are quiet and powerful.
These German made extractor fans are low wattage, high output and designed to handle both low air volume hobby use and high air volume commercial use. These fans can be run 24hours, 7 days a week, 365 days a year without any problems. In fact, this is what they've been designed for.
The fan brackets (supplied in the box) allow for easy installation to the floor, wall or ceiling.
To calculate the size of fan you require simply follow these instructions:
Measure the height, length and width (in metres) of the growing environment.
Multiply together (H x L x W) to give the cubic metre volume.
Multiply this figure by 60.
This is the size of fan required to change the air 60 times in an hour.
Buy the fan slightly above the figure calculated if possible to ensure adequate ventilation.
4"/100mm - 175m3/hour
5"/125mm - 225m3/hour
6"/150mm - 420m3/hour
8"/200mm - 750m3/hour
10"/250mm - 1000m3/hour
12"/315mm - 1300m3/hour