help with ventilation

[moogwai]

Hi guys,
ventilation is not my strong point so bear with me and would rather ask about it than get myself in the shoite.
Just been to a first floor flat which has had its warm air boiler shut off by transco due to the apparant lack of ventilation for the appliance.
The boiler is situated in a hall probably 3m long and has a lounge, a kitchen with an air brick (albeit covered by the washing machine),a bathroom with a vent direct to out side air and the front door which leads onto a landing in the communal area with a front and back door off it (very drafty).
None of the doors have any ventilation and the appliance has a heat input of 10.8kw.
I need help with getting the correct ventilation for the appliance and which doors i would need to put the vents in or whether i would need to put vents in all of the doors.
Any help would be appreciated. cheers.

after just reading through my viper book i have seen that i am able to take the path of ventilation through the bathroom because the appliances heat input does not exceed 12.7kw, so..
i need 5cm per kw over 7kw so therefore i would need a vent providing at least 20cm of ventilation??

can someone please confirm this for me.

 

[gbgas001]

Hi

Im taking that the appliance is an open flued unit?
and the appliance is in a cupboard?
and the appliance has a return air duct fitted into a different room.

if so then the cupboard requires top and bottom vent into the corridor

top 10.8 divided by 1.1 x 10cm2 = _________cm2
bottom 10.8 divided by 1.1 x 20cm2 = _________cm2

you also require a vent to outside this could be in the communal area

10.8 divided by 1.1 -7kw x 5cm2 = _________cm2

if you have to go through another door from the corridor to the communal area then you would fit another vent 50% bigger than the one you took to outside.

You cannot take ventilation through a bathroom for an open flued appliance no matter what size it is unless its ducted through. and it can only be taken through a bedroom if the appliance is less that 14kw gross and has an ASD on it.

Hope this helps

Regards
gb-gas

 

[moogwai]

Hi gbg.... yes its open flued and the unit isn't in a cupboard,it sits within the walls directly in the corridor. I cant put a vent into the front door as this may affect the integrity of the door. The only way i can see me being able to vent this correctly is by putting in a new vent into the kitchen and putting a vent into the kitchen door. Would you agree? cheers.

p.s and i read my viper book wrong about venting through the bathroom....i realised about 15mins ago!

 

[gbgas001]

Hi moogwai
that looks like the best alternative. Make sure the vent through the kitchen door is 50% bigger than the one to outside.

Happy venting
Gb-gas

 

[moogwai]

will do mate,thanks.

 

[kirkgas]

Hi moogwai
that looks like the best alternative. Make sure the vent through the kitchen door is 50% bigger than the one to outside.

Happy venting
Gb-gas

if you only need 2 vents (1 in outside wall in kitchen, and 1 in kitchen door to get combustion air to the boiler) then you dont increase the size of the second vent, IF you need a 3rd vent then you make 2nd & 3rd 150% size of vent 1

 

[moogwai]

ok thanks mate.