One to get rid of the combustion products which are very dangerous.
Wall air vents for gas fires.
Unless you have a special type of flueless fire.
You need another to supply fresh air to the fire to get correct combustion.
If you don t have this your fire will create large quantities of dangerous fumes.
However many direct vent fireplaces are vented with a single two chamber vent pipe.
One that expels gasses and another that draws in fresh air from the outside.
Entering while allowing a measured amount of air to enter the room either for background or for combustion purposes.
The major price difference between the two types of fireplaces is with venting.
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.
On a normal gas fire you need two vents.
Air vents for flueless gas fires and stoves.
This is not the official energy efficiency rating of the fireplace that is 100 the sap rating of 90 is greater than any other style of fireplace when installed in a new build property.
The purpose of a ventilator is to protect from rain vermin etc.
Gas fires less than 7kw no air vent chimney precast flue liner cvo fire 2020 05 07t23 26 00 01 00 chimney gas fires 7kw.