| 摘要 |
<p>A replaceable foam insulation system for a cavity (12) in walls or a roof of a building structure is sealed to ensure foam does not escape through vents from the cavity and can be easily destroyed without leaving a residue in the cavity. The system comprises at least one enclosed, recirculating, substantially horizontal passage (13) within the cavity (12), means (22) for recirculating air or gas through the passage in the cavity, and foam producing means (23, 24) in the passage (13) positioned immediately downstream of the means (22) for recirculating air or gas, the foam producing means (23, 24) and the means (22) for recirculating air or gas when operating together providing foam to substantially fill the passage (13) in the cavity (12), and the means (22) for recirculating air or gas, when operating alone, destroying substantially all the foam in the passage.</p> |
