Internal wall in AISI 316L and external wall AISI 304 for seal.
Air inlet and gas outlet in boilers with possitive positive pressure up to 200 Pa (type P1) that work in dry or wet conditions (condensation) and and use gas, gas oil or solids (fi rewood, pellets, etc.) as fuel.
With seal (1) EN 1856-1 T200-P1-W-V2-L50040-0(50)
Without seal (2) EN 14989-2 T450-N1-W-V2-L50040-G(100)
Distance to combustible materials:
(1) / with seal (for gas and gasoil) = 50mm
(2) / without seal (for solids) = 100mm