Airflow Airflex ISO Pipe 180mm Diameter 2000mm Long house-size-200-249 MEV is an abbreviation of

MEV is an abbreviation of Mechanical extract ventilation

So if you have a R90T then this fan is its direct replacement and it will fit in the same space as your existing product and ducting

Outside Grille

Also included is an extra wide

Incorporating 46 interior & exterior pockets

Airflow Airflex ISO Pipe 180mm Diameter 2000mm Long house-size-200-249 MEV is an abbreviation ofPre insulated one piece Quick and easy assembly Tough, durable, anti static EPP Fire retardant to B2 Avoids condensation build up Sound absorbing, smooth bore pipe Choice of components to suit any layout Specifications Thickness: 15 mm Material density: 60g dm3, antistatic Thermal conductivity: 0. 042 W mK Application range: 25 C to +80 C Elasticity: 30% DIN 52612