Fire stop

Fire stop size: 7″ / 180mm (for 5 twin wall flues)
Fire stop size: 8″ / 200mm (for 6″ twin wall flues)
Fire stop size: 10″ / 250mm (for 7″ & 8″ twin wall flues)

The Ventilated Firestop must be used on solid fuel appliances.
A Firestop plate is used to allow the chimney to pass between floors, for example, when you need the chimney to go through the ceiling on the ground floor through to the first floor. The steel plate is designed to provide the appropriate distance between the flue and the adjacent flamable materials, according to both fire and building regulations. It is attached to the underside of the ceiling. If you are going through a second ceiling then you should use a second Firestop plate on the floor and again on the first floor ceiling.
You should use a Ventilated Firestop when the installed appliance will burn solid fuels, for example wood, coal, etc. 
A Non-Ventilated Firestop plate can be used on installations burning gas or oil. 

APPLICATION
For use on solid fuel and gas/oil appliances. eg: woodstoves, gas coal effect fires, oil boiler and any solid fuel appliances.

CONSTRUCTION
Distance to combustibles is 60mm.

APPROVALS
KC is HETAS Approved and is CE marked.
Designation Number
EN1856-1 T600 N1 D V2 L50040 G60.

INSTALLATION
Twin Wall Insulated Chimney parts are secured together by using a Locking Band.
Make sure that you keep a distance of 60mm from the outside of the flue to any combustible material (wood, plaster board).