Ventilation duct construction and method
AssigneeSaint-Gobain Isover
InventorStaffan Tigerfeldt
Life of this patent
Estimating the term…
Abstract
The present invention relates to an ventilation duct construction and a method which increases the fire-retardant capability of a ventilation duct. According to the invention, an improved fire-retardant capability of a ventilation duct or sound absorber is obtained by providing the ventilation duct with a shielding sheet at a distance from the same so that an air gap is formed therebetween. The time during which the outside temperature of the construction can be kept down is prolonged, while the construction remains compact.
Claims37
A ventilation duct construction, comprising:
- a ventilation duct tough which air is allowed to flow, the duct being insulated by means of insulation in contact with and surrounding a wall of the duct;
- a shielding sheet, shielding sheet being arranged external to and at least partially around the duct and its associated insulation at a distance from the duct such that an air gap is formed between the shielding sheet and the insulation, without the shielding sheet forming part of a mechanically continuous fluid path with the insulated duct, wherein a fire-retardant capability, measured as a capability to resist a temperature rise of the duct air that causes a temperature rise on an outside of the construction outside of the shielding sheet is considerably increased.
A method of providing a ventilation duct, comprising the steps of:
- insulating the duct by means of insulation in contact with and surrounding a wall of the duct;
- and
- placing a shielding sheet external to and at least partially around the insulated duct at a distance from the duct such that an air gap is formed between the shielding sheet and the insulation, without the shielding sheet forming part of a mechanically continuous fluid path with the insulated duct, so that the fire-retardant capability of a ventilation duct is increased.
A ventilation duct construction, comprising:
- a ventilation duct through which air is allowed to flow, said ventilation duct being passed through a through hole in a wall;
- a shielding sheet comprising a first portion extending essentially in parallel with the ventilation duct without being passed through said through hole, and a second portion extending essentially in parallel with the penetrated wall and being located at an end of said first portion nearest to the penetrated wall, said shielding sheet being arranged external to and at least partially around the duct at a distance from the duct such that an air gap is formed between the shielding sheet and both the duct and the penetrated wall.
A method of providing a penetration of a ventilation duct in a wall, comprising the steps of:
- making a through hole in the wall;
- passing the ventilation duct through the hole;
- and
- placing a shielding sheet, which comprises a first and a second portion, external to and at least partially around the duct at a distance from the duct such that an air gap is formed between the shielding sheet and both the duct and the penetrated wall, and so that the first portion extends essentially in parallel with the ventilation duct without passing through said through hole and the second portion extends essentially in parallel with the penetrated wall and being located at an end of said first portion nearest to the penetrated wall.
A method of providing a ventilation duct construction which comprises a ventilation duct through which air is allowed to flow, said ventilation duct being passed through a through hole in a wall, the method comprising the step of:
- placing a shielding sheet, which comprises a first and a second portion, external to and at least partially around the duct at a distance from the duct such that an air gap is formed between the shielding sheet and both the duct and the wall, and so that the first portion extends essentially in parallel with the ventilation duct without passing through said through hole and the second portion extends essentially in parallel with the penetrated wall and being located at an end of said first portion nearest to the wall.
A Ventilation duct construction, comprising:
- a ventilation duct through which air is allowed to flow, the duct being insulated by means of insulation in contact with and surrounding a wall of the duct;
- a shielding sheet, the shielding sheet being arranged external of and at least partially round the duct with its associated insulation at a distance from the duct such that an air gap is formed between the shielding sheet and the insulation,
- the air gap being subject to natural convection during normal operation of the ventilation duct construction in case of a change of temperature therein in relation to the temperature of the ambient air, by being arranged in fluid communication with the ambient air so as to enable air to enter the air gap at one area of the shielding sheet and exit the air gap at another area of the shielding sheet,
- whereby fire-retardant capability, measured as a capability to resist a temperature rise of the duct air that causes a temperature rise on the outside of the construction outside of the shielding sheet is considerable increased.
Dependencies are inferred from the claim text.