NA 041
DIN Standards Committee Heating and Ventilation Technology and their Safety
Technical rule
[Withdrawn]
VDI 3803 Blatt 4
VDI 3803 Blatt 4
Air-conditioning, system requirements - Air filter systems (VDI Ventilation Code of Practice)
Title (German)
Raumlufttechnik, Geräteanforderungen - Luftfiltersysteme (VDI-Lüftungsregeln)