This can vary due to your boiler but for most purposes 75mm above the boiler flue. Protects your boiler from damaging rain ingress in heavy rain and wind. It was also protect your boiler in the event of guttering failure.
eBay
148x55cm Ironing Board Cover Large Ironing Cover Ironing Board Protective Non-slip Thick Colorful for Home Cleaner
Aliexpress UK
For ventilation ducts, chimneys and air extraction hoods. Guards provide maximum protection without compromising chimney performance. Due to the light and screen setting difference, the item's color may be slightly different from the pictures.
eBay
Garden Furniture Cover with Air Vent Waterproof Windproof Anti-UV Heavy Duty Rip Proof 600D Oxford Patio Garden Table Cover Pack
Aliexpress UK
For ventilation ducts, chimneys and air extraction hoods. Guards provide maximum protection without compromising chimney performance. 1 x Chimney Cap. Size: 75mm,110mm, 160mm,200mm (as shown in the picture).
eBay
Bathroom Sink Overflow Covers Trim Ring Cap Round Ring Basin Insert Replacement Useful Sink Hole Cover Tub Drain Stopper
Aliexpress UK
DKN Supplies Ltd is your first choice for buying caravan accessories online.
eBay
Plastic Wall Wire Hole Decor Cover Separable Junction Box Outlet Cable Protector Snap-on Plate Angle Valve Pipe Plug Decor Cover
Aliexpress UK
Pipes lenght 100cm, 50cm,25cm. thickness material 0.6mm.
eBay
Garden Parasol Cover with Rod & Pull Ring UV Protection 210D Oxford Waterproof Fabric Cantilever Large Umbrella Cover Outdoor
Aliexpress UK
For ventilation ducts, chimneys and air extraction hoods. Guards provide maximum protection without compromising chimney performance. 1 x Chimney Cap. Made of high-quality 304 stainless steel, cold and high temperature resistant, durable.
eBay
1PC 35/40mm Faucet Spool Gland Shower Fixing Cap Cover Bowl Decorative Cover Kitchen Basin Faucet Replacement Accessories
Aliexpress UK
The cover is made of glass, allowing light to filter through and illuminate the intricate details of the design.
eBay
3x3M Garden Gazebo Top Cover Canopy Replacement Top Canopy Cover 2 Tier Outdoor Patio Garden Tent Roof Top for Patio Sunshade
Aliexpress UK
Boiler Flue Rain Cover Cowl Guard - Gloss Black 180mm Width is 180mm Length is 234mm Height is 46mm Can be used to protect cameras and other products requiring canopies Made from hard wearing heat and water resistant PETG best quality guaranteed I am the only seller who sells this product in this particular style
eBay
4pcs PVC Handrail End Cap Round Stair Treads Cover Fittings 45mm Handrail Stair End Cap Wood Rail Sealing Covers Plugs
Aliexpress UK