vent on door

Status
Not open for further replies.
G

geojack

hi there ,
i have a back boiler heating system,the gas fitter told me i have no air brick in my sitting room so he told me i would have to put a vent in the door .
should i put it at the bottem or the top of the door and how big should the vent be
yes i know i sould have asked him, but for some reason i didnt.

thanks in advance
 
im not a plumber , that means nothing to me. i am thick.
should i just drill as many holes as the vent will hide.

do i do it at the bottem of the door
 
migoplumber said:
5cm2 per kw, is the rule of thumb - some times it's less
Click to expand...

open flued ventilation is not rule of thumb, it is a defined calculation that should be calculated by someone who is clear on the rules, best to get gas engineer back to discuss the options for position/type etc, if you post the exact make & model of the fire & boiler we can work out the vent size for you, but best to have someone sort out the vents for you, as the actual type of vent fitted needs to be right, as well as the correct size.
 
as kirk says,give us make,model,and kw input rating we can work it out from there,trouble is you are on about cutting the max that a vent will hide typically 127 cm2 it may be less,you dont drill a series of holes you go to the aggregate size
 
not that simple either vent cannot be at top must be no more than 450mm i think high and if in series will need to be huge as you need the combustion vent to outside then the clear path for air to the the boiler
that enginner should not have left your property with that boiler running
back boiler open flue prob about 20kw
so vent to outside air is 100cm sq as i assume it has a fire on front of boiler
these need correct amout of air for combustion that i would have classed as at risk and turned it off all air for combustion is being taken at present from the room and if door is closed only adventitious air entering room very bad of gas engineer to walk away from a open flue appliance with no ventilatio....was he a gas safe engineer or john wayne😱
 
Well if he gave the customer no paperwork,no details of vent or his options ,left boiler working with not warning label,I would go with John Wayne 🙁

geojack,what was the reason he was there,get this ventilation sorted asap ,it is very important for your safety !!
 
well without seeing job my thought are 80cm sq vent is required for ventilation to outside air direct
so outside wall 80cm sq and through door again 80cm sq (2 vents in total one in door no higher than 450mm

but if outside wall vent and then passes another 2 rooms to reach boiler then
outside vent 80cm next vent 120cm and third vent 120cm
this is all based on boiler being range rated at 17kw gross heat input

orig engineer if he walked away with issuing warning and capping off boiler needs to be shot
 
geojack said:
hi mate
my boiler and fire is a baxi bermuda 45/4E

G.C.N 44 077 73
Click to expand...

45/4E is the boiler we need to also know the model of the fire, (data plate is on left hand side of fire, Bermuda is the whole range,

also once the vent size has been agreed there is still the issue of having an gas approved vent type, properly fitted etc etc etc, get a gas engineer in, PLEASE!!!!!!!!!!!
 
Im just doing my gas trainning,if i remember its add both appliances together then deduct 7kw for adventurous air than x by 5cm2.
 
just to clarify kirk,and this is mi instructions on most of baxis burmuda range,fire is not taken in to account under 7kw, surprised me when i found that one out
 
fire would account for the adventitious air
but the gist of this is that no vent is ar and should have been capped off
 
yes thats right,i wont service one of these if no vent present,i always ask before attending
 
theres a air brick in the kichen but not in the sitting room where my fire and back boiler is why is n
this
 
no i havent , i have solid concrete floors downstairs but outside on the kichen wall theres an air brick
 
gas man said:
just to clarify kirk,and this is mi instructions on most of baxis burmuda range,fire is not taken in to account under 7kw, surprised me when i found that one out
Click to expand...

that is not correct, when calculation multi appliances (in this instance you treat them as seperate, i know they are classed as a combined unit) you add max HI of all open flued appliances in the room, divide by 1.1 to get to net if required (would prob be required on a BBU data badge will confirm) -7 then *5, so you dont discount a 6kw fire and count just the boiler
 
geojack said:
no i havent , i have solid concrete floors downstairs but outside on the kichen wall theres an air brick
Click to expand...

like somone has just said vent size (cm2) = (maximum net input in kw-7kw) x 5.

so if you gas fired back boiler is 20kw:
20kw-7kw =14kw
14x5=70 cm2
a 70cm2 vent is about 100mmx100mm in size, get the correct one from a plumbers merchant.

if the air brick in the kitchen is the correct size needed and of the correct type (any old "hole" wont do) then you only need to put a vent in between the room with the boiler and the room with the air brick, (of 70cm2) if there is three or more vents in series then each vent needs to be increased to be 50% increments ie if you vented from the boiler room into the lounge then into the kitchen which has the outside vents.

Ventilation is very important, dont think that just because it "works" and "has done for years" that it will be ok, it wont one day.
 
Last edited by a moderator:
geojack said:
no i havent , i have solid concrete floors downstairs but outside on the kichen wall theres an air brick
Click to expand...

YOU NEED TO GET A GOOD GAS ENGINEER IN, AN AIR BRICK DOESN'T MEET THE CRITERIA FOR A GAS VENT, things are getting confusing as we discuss all the different bits & bobs for this.
 
I use the staduim black hole ventilators TM, they have internal baffels which cut down on any draughts and will fit a core drilled hole nicely.
 
to original poster
get a competent gas safe registered engineer to your property to get correct ventilation for what is infact a death trap
 
Blackcatgas said:
like somone has just said vent size (cm2) = (maximum net input in kw-7kw) x 5.

so if you gas fired back boiler is 20kw:
20kw-7kw =14kw (20-7=13)
14x5=70 cm2
a 70cm2 vent is about 100mmx100mm in size, get the correct one from a plumbers merchant.


Ventilation is very important, dont think that just because it "works" and "has done for years" that it will be ok, it wont one day.
Click to expand...


i agree that vents are important, but so is careful calculations!!!!!!
20/1.1-7*5= 56cm2, but this isnt accurate, as i said earlier it depends on what fire front is fitted, guys we are trying to advise the OP here and now confusing ourselves, a 45/4E with a PW5 fire needs 82cm2, but if it has a LFE5 fire it needs 86.68cm2 lets get it right or the poor OP is going to rip it all out an get an electric boiler fitted
 
Last edited by a moderator:
Status
Not open for further replies.

Featured Content

Back
Top