4 Attachment(s)
How long should a Bathroom Fan timer run for + adequate ventilation, Air Change perHr
I have a bathroom with toilet and shower and I am wanting to install a exhaust fan timer.
It either does not get turned on and leaves the whole room dripping in water or left on all day or worse.
|
|
m |
feet |
|
|
|
3.28084 |
m2 |
Lenght |
3.4 |
11.2 |
8.16 |
Width |
2.4 |
7.9 |
|
Heigh |
2.4 |
7.9 |
|
Volume
|
19.6m3
|
691.6
|
I have a Fantech ECE152 fan installed. Its a Fan in flue design whereby the motor is pulling air not sitting on the ceiling pushing it, apparently this is both more powerful and obviously quieter. In fact very quiet which contributes to it being left on.
It is also ducted.
https://www.fantech.com.au/FanData.aspx?Pid=ECE152M
https://www.fantech.com.au/images/PDF/Catalogue/ece.pdf
Attachment 537575
Attachment 537576
The fan is 532 m3/h or 313 CFM and the bathroom is 19.6m3 (from above) so the Air Changes per Hour are = 532/19.6 = 27.17
I found this
Quote:
According to the
Home Ventilation Institute (HVI), for a bathroom to be adequately ventilated, it needs to undergo approximately 8 air changes per hour. The HVI recommends 2-3 air changes or running the fan for 20 minutes after showering to remove all the steam from the bathroom after a shower.
I have the option of a Timer with two models one with a 6 and 12 minute delay.
so at 12mins with a 532 m3/h fan in a 19.6m3 bathroom I will get 12/60*27.17 Air Changes or = 5.4 which is double the 2-3 air changes above.
this link (image attached of my results) seems to indicate its the right size as well
Attachment 537578
https://universalfans.com.au/exhaust-fan-calculator/
What recomendations or comments do people have?
(PS I realise when ducting is added with bends and straight ducting vs flex, the capacity becomes worse)