No.	PRODUCT	MANUFACTURER	PRICE	RATINGS	POPULARITY	LINK
1.	100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps	Manrose	£5.72	(from 292 reviews)	7.6	VIEW PRODUCT
2.	4 INCH ROUND 100MM BACKDRAUGHT SHUTTER CONNECTOR TO CONNECT DUCT PIPE AND PREVENT COLD AIR COMING THROUGH WITH BUILT IN DAMPER BY KAIR VENTILATION	Kair	£4.99	(from 33 reviews)	6.5	VIEW PRODUCT
3.	Blauberg UK PVC Flexible Ducting 100mm x 3m, White	Blauberg UK	£5.40	(from 83 reviews)	6.2	VIEW PRODUCT
4.	4 INCH ROUND 100MM WHITE LOUVRED WALL VENT AIR GRILLE WITH FLYSCREEN - INTERNAL OR EXTERNAL USE - DUCTING FITTING BY KAIR VENTILATION	Kair	£5.99	(from 9 reviews)	5.9	VIEW PRODUCT
5.	Blauberg UK RS 150/100 Reducer - 6" to 4" (150-100mm) for ducting and Extractor Fans, White 100mm - 150mm	Blauberg UK	£5.45	(from 34 reviews)	5.8	VIEW PRODUCT
6.	DUCTING REDUCER 6 TO 4 INCH - STRAIGHT 150MM ROUND TO 100MM DUCT PIPE BY KAIR VENTILATION	Kair	£5.98	(from 55 reviews)	5.7	VIEW PRODUCT
7.	125mm x 3m metre 5" PVC round Flexible Ducting / Flexi hose		£6.95	(from 1 review)	5.7	VIEW PRODUCT
8.	PVC Flexible Ducting 150mm x 3m	Kair	£7.99	(from 36 reviews)	5.5	VIEW PRODUCT
9.	Bulk Hardware BH02039 Tumble Dryer Ducting Kit, 100mm (4 inch)	Bulk Hardware	£10.97	(from 27 reviews)	5	VIEW PRODUCT