Occupancy operated extractor fan

[NozSpark]

Hi,

I have to quote to replace an 4" extractor fan in a school toilet. The fan is mounted in the ceiling, above which is a decent void, but it is innaccesible (except from where the fan is going and where the grille is)!!

Now the room is 15.2 cubic meters and I think it will need a fan that will do at least 10 air changes/hour. As most axial fans don't really do well on ceilings I was going to fit a centrifugal fan and an occupancy sensor and hopefully re-use the existing ducting etc.

Does anyone know of a fan that fits the bill, but which is also not too expensive??? (Tight budgets...)

 

[Andy™]

here,

here, or even here

 

[Andy™]

but on a more serious note... cant think of any

 

[Andy™]

what about (6")

?

(there

 

[NozSpark]

here,here, or even here

Cheers Andy,,, those first 2 will suck the kids out:^O:^O:^O... It is an Infants school!!!!

And that last one... I think thats what they have ATM:O:O

 

[NozSpark]

what about ?

(there

 

[Andy™]

get a 12" grill just so you can get access?

 

[NozSpark]

Do they do a 12" to 4" reducer?????

 

[Andy™]

Do they do a 12" to 4" reducer?????

not sure about directly 12 to 4, but there may be 12 to 6 then 6 to 4 etc. never really done much with fans like that

 

[NozSpark]

I may be able to wangle an access hole and cover...

Will have to check with the main contractor,,, but I doubt it as he said he didn't want to mess with the ceiling/roof

 

[Andy™]

so much easier with suspended grids

 

[binky]

Hi,As most axial fans don't really do well on ceilings I was going to fit a centrifugal fan and an occupancy sensor and hopefully re-use the existing ducting etc.

Never known this to be a problem??? Given tight budget and lack of access like for like is probably best option.

 

[M107]

Xpelair do a 10" ceiling mounted fan.