| WALL VENTILATORS | CAVITY TRAYS LTD |
| DOMUS VENTILATION |
| GDHV VENTILATION - GLEN DIMPLEX HEATING & VENTILAT |
| KLOBER LTD |
| TIMLOC BUILDING PRODUCTS |
| WALL VENTILATORS Cavity Sleeves | TIMLOC BUILDING PRODUCTS |
| WALL VENTILATORS Cavity Wall Weep Vents | CAVITY TRAYS LTD |
| HAMBLESIDE DANELAW LTD |
| TIMLOC BUILDING PRODUCTS |
| WALL VENTILATORS Natural | CAVITY TRAYS LTD |
| SE CONTROLS |
| TIMLOC BUILDING PRODUCTS |
| UBBINK UK LTD |
| VERPLAS LTD |
| ZEHNDER LTD |
| WALL VENTILATORS Telescopic | CAVITY TRAYS LTD |
| HAMBLESIDE DANELAW LTD |
| TIMLOC BUILDING PRODUCTS |
