The regulation states that due to the air vent in the same room as the appliance the gas fire must be rated at 90 not 100.
Wall air vents for gas fires.
One that expels gasses and another that draws in fresh air from the outside.
The major price difference between the two types of fireplaces is with venting.
Air vents for flueless gas fires and stoves.
Entering while allowing a measured amount of air to enter the room either for background or for combustion purposes.
Direct vent gas fireplaces require two vents in the back.
You need another to supply fresh air to the fire to get correct combustion.
However many direct vent fireplaces are vented with a single two chamber vent pipe.
Superior fires air vents are a necessity to have a complete fully functioning flueless gas fire or gas stove.
These 7kw contemporary gas fires listed below have a power input rating of less than 7kw and do not require an air vent in the room and have a minimum flue size of 125mm pre cast or class 2 brick chimney.
One to get rid of the combustion products which are very dangerous.
Unless you have a special type of flueless fire.
The purpose of a ventilator is to protect from rain vermin etc.
If you don t have this your fire will create large quantities of dangerous fumes.
On a normal gas fire you need two vents.