IMO MRH

Warranty
6 MRH 18.08.2022
2.2.2 Work on the electrical equipment
 Work on the electrical equipment of the fan may only be done by a qualified electrician or electro technically edu-
cated person. This person must know the relevant safety rules to recognise and avoid potentially risks.
2.2.3 Personnel for operation, use, maintenance and cleaning
 Operation, use, maintenance and cleaning may only be carried out by trained and authorized personnel. The oper-
ating personnel must have appropriate knowledge about handling with the device. In the case of a malfunction or
an emergency, they must react correctly and adequately.
2.3 Intended use
MRH motorised roof hatch with service switches is intended for insertion of smoke and heat extract fan with motor
inside air stream (AXC(F), AXC(B), AXC(R)). In case of fire, it is used to extract smoke gases from the room. Ventilated
areas and emergency exits contribute to easier evacuation of people and equipment in the event of fire, and to faster
and more efficient fire extinguishing; they protect the building structure and equipment against excessive tempera-
tures and decrease fire escalation to the surrounding areas. In serially available version, the hatch is intended for
emergency use only (without EMC protection). Tested also to Re 10000 (cycles open - close), but for dual use addi-
tional safety elements are needed to reduce risk due to hatch closing (see 9.3, 9.4). For installation on the top of
buildings up to snow load SL 1000 rsp. SL 1250 at size 1250 (EN 12101-3) and wind load WL 1500 (EN 12101-2, 3).
 The fans are suitable for extraction of clean air, air with a low dust and grease content.
 The maximum permissible operating data on the name plate apply for an air density ρ = 1,2 kg/m³ (sea level) and a
maximum air moisture of 80 %. Depending on air moisture a periodical ventilation by opening hatch to prevent
condensation on hatch is recommended.
 Temperature of medium -20 up to 55°C, respectively according temperature/time class of the axial fan.
 In case of fire, all motor protective devices of the fan must be bridged to guarantee functional capability (connec-
tion direct to mains). Specific instructions of the inserted axial fan should be observed.
2.4 Improper use
Above all, the improper use means using the fan in a way other than that described. The following points are improper
and hazardous:
- Use of a fan with improper identification (temperature/time class in case of smoke extraction);
- Not suitable to exhaust dust containing medium or medium with such dust concentration, that could
affect with dust deposits on operation and explosion protection (appropriate filtering necessary);
- Extraction of grease containing media;
- Exhaust from explosion hazardous zones;
- Exhaust aggressive atmosphere;
- Operation without duct system or protective guard (intake protection);
- Operation with the air connections closed or in instable area;
- Operation without effective (PTC or other) thermal protection (exception: fire mode). At AXC(F), AXC(B)
AXC(R) fans PTC is optionally built-in!
3 Warranty
Warranty for our products shall be determined according to the contractual agreements, our quotations and, as a sup-
plement, our General terms and Conditions of Business. Warranty claims shall presuppose that the products are cor-
rectly connected, operated and used accordingly to data sheets, and regularly maintained.