question about cooker hood liner

[peachygirl]

we have just moved into a house with a cooker hood. I've never had one before.
I bought some new liners from lakeland at the weekend and changed the liner today.
What I took off the hood does not look like the liners I bought. It was black and backed with fluffy stuff.
Will the lakeland liner be OK?
do I need to put the original thing in too?

You get two kinds of filters - one for an internal wall, and one that flows to an outside wall. Have you got the right kind?