Abstract: A system includes an exhaust hood having a housing and an exhaust conduit disposed on the housing, a support for mounting the exhaust hood to a wall or ceiling, and an exhaust duct extending in the wall or ceiling. The exhaust conduit has a first coupling member disposed on a holder so as to hold the first coupling member on the housing. The exhaust duct includes a second coupling member. At least one of the first and second coupling members has an aligning device for automatically aligning the coupling members with each other when bringing the system into a mounted condition. The first coupling member is disposed relative to the holder and the second coupling member is disposed relative to the support so as to each be movable in a direction substantially perpendicular to the coupling direction.

Abstract: A system includes an exhaust hood having a housing and an exhaust conduit disposed on the housing, a support for mounting the exhaust hood to a wall or ceiling, and an exhaust duct extending in the wall or ceiling. The exhaust conduit has a first coupling member disposed on a holder so as to hold the first coupling member on the housing. The exhaust duct includes a second coupling member. At least one of the first and second coupling members has an aligning device for automatically aligning the coupling members with each other when bringing the system into a mounted condition. The first coupling member is disposed relative to the holder and the second coupling member is disposed relative to the support so as to each be movable in a direction substantially perpendicular to the coupling direction.

Abstract: A room which is substantially sealed or sealable from the surrounding atmosphere is conditioned by a plant which has a fluid heating or cooling unit, one or more heat exchangers, conduits which connect the unit with the heat exchanger(s), and a computer which is connected with sensors serving to transmit signals denoting the temperature t.sub.V of fluid in the conduit or conduits leading from the unit to the heat exchanger(s), the temperature t.sub.R of fluid in the conduit or conduits leading from the heat exchanger(s) to the unit, and the rate m of fluid flow in the conduit or conduits. These signals are used to calculate a so-called load range prevailing in the room in accordance with the equation (t.sub.V -t.sub.R).times.m. The calculated load range is compared with the load ranges of a pattern of load ranges which are characteristic of the plant, and the computer adjusts the unit or a mixing valve in the conduit or conduits leading to the heat exchangers(s) in order to change the value of t.sub.