FRV160THVNT Fiamma Thermo Vent Kit For 160 Rooflights 400mm x 400mm (144 ratings) £7.99 inc. VAT (where applicable) Quantity: at £7.99 each Add To Basket 0 in your basket View Basket Checkout THERMO VENT 40 Insulated vent shield. Keeps your RV warmer in the winter and cooler in the summer! Suitable for all 40x40 rooflights. The aluminium surfaces assist by reflecting sunlight and by reducing heatloss. Dimensions: L40 x W40 x H0,6 cm.