The device (accessory) allows the supply of combustion air to the ATMOS A25 burner from outdoor areas, for example for objects requiring a blower door test (building airtightness test).
The device is intended only for the ATMOS A25 burner and pure pellet boilers from the ATMOS company up to a boiler output of 25 kW.

Designed for boilers with an exhaust fan

D20P, D15PX, D20PX, D25PX

Designed for boilers without an exhaust fan

D15P, D10PX, D14P, D21P, D25P

Kit composition:
1 – 1x external air supply flange for A25
2 – 1x seal under the flange of the external air supply
3 – 15x screw Ø 4 mm (with drill)
4 – 4x screw 4×30 mm (for dowel)
5 – 4x dowel
6 – 1x aluminum hose with an inner diameter of 100 mm and a length of 5 m (for a hole in the wall Ø 110 mm)
7 – 1x flexible hose with a diameter of 100 mm and a length of 70 cm (for DxxPX, PXxx)
8 – 1x hose holder with socket – flexible and fixed hose coupling (for DxxPX, PXxx)
9 – 3x hose holder – for attaching the hose to the boiler or to the wall
10 – 3x cable tie to attach the hose to the hose holder with a nozzle
11 – 1x cover – external grille on the facade of the house (round – Attention: not to be confused)

Examples of installation of external air supply in boiler rooms

Boiler: DxxPX

Installation with right outlet and flexible hose for easy door opening – one 90 ° elbow

6 – aluminum hose Ø 100 mm
7 – flexible hose
8 – hose holder with nozzle
9 – hose holder
11 – external grille on the facade of the house