Ventilasjonsentreprenører

Aircomfort Trøndelag AS

Caverion Norge AS, Oslo

Entek Sandefjord AS

Hamstad AS

Ing. S. D. Baastad AS

Ingeniørfirmaet L.S. Solland AS - Stavanger

Lid Ventilasjon AS

Martin Kristiansen AS

Nord-Klima AS

Nordvest Miljø AS, Ålesund

Plato AS

Randem & Hübert AS