Ventilation and particulate matter removal system

1 . An apparatus for removing particulate matter from an enclosure having an internal space and an opening into the internal space, comprising:

a cover securable to the enclosure so that the cover covers the opening, the cover comprising multiple access ports;

a blower for establishing at a gas inlet of the blower a partial vacuum for drawing gas and particulate matter entrained therein from the internal space through an exhaust port open into the internal space and then through an exhaust conduit thereby maintaining a partial vacuum within the internal space; and

a lance connectable to a gas supply external to the enclosure for use;

wherein:

the lance is configured to be hand-held by a user outside the enclosure and comprises a lance valve operable by the user to vary flow of gas into the lance, and an elongate tube for direction of gas from the valve to an open end of the tube;

each access port is configured for insertion, by the user, of at least a portion of the elongate tube slidingly therethrough and to limit fluid movement into and out of the internal space both when the tube is received therein and when the tube is not received therein;

each access port is configured to permit the user, by manipulation of the lance, to vary both an orientation of the tube relative to the cover and an extent of penetration of the tube into the internal space;

wherein when the tube is slidingly inserted through any one or more of the access ports of the cover and the lance valve is operated by the user to enable the flow of gas into the lance, particulate matter within the internal space is dislodged by gas flowing from the open end of the tube, entrained in gas within the internal space and thereafter drawn from the internal space through the exhaust port and the exhaust conduit;

and wherein a hose end portion of the exhaust conduit is configured to be disconnectable from the exhaust port so that vacuum cleaning can be effected by the hose end portion being moved by the user into required locations as air is drawn into the end portion by the blower.

2 . The apparatus of claim 1 , further comprising a nozzle configured to increase flow velocity at an inlet of the nozzle, the nozzle being securable to the disconnected hose end portion of the exhaust conduit when the apparatus is configured for vacuum cleaning.

3 . The apparatus of claim 1 , wherein a second valve is provided in the exhaust conduit enabling the user to select flow towards the blower from the exhaust port only or from a vacuum hose connected at one end to the further valve and having a free end movable by the user to required locations for vacuum cleaning.

4 . The apparatus of claim 3 , further comprising a nozzle configured to increase flow velocity at an inlet of the nozzle, the nozzle being provided at the free end of the vacuum hose.

5 . The apparatus of claim 3 , wherein a nozzle fitting configured to be enterable into any of the access ports of the cover is provided at the free end of the vacuum hose whereby to enable vacuum cleaning within the internal space without removal of the cover.

6 . The apparatus of claim 3 , further comprising, upstream of the gas inlet of the blower, at least one of a filter, multiple filters, and a cyclone separator, that separate entrained particulate matter from gas that has been drawn through the exhaust conduit and the second valve.

7 . The apparatus of claim 1 , wherein the lance has connections to the gas supply and to a duct in fluid communication with the exhaust conduit and the lance valve is configured to enable the tube of the lance to be connected to one or the other but not both of the connections, whereby blowing of gas into the internal space or vacuum cleaning in the internal space can be effected.