The stoves in this collection are 40-45cm in width.
We recommend that, as long as the stove's installation manual does not say otherwise*) the minimum air gap at each side of the stove is as follows:
10cm if the fireplace recess is lined with a fireproof board or render (less likelihood of any board or render cracking with heat)
5cm if the fireplace recess is unlined and made of brick or stone
*Once you have decided on a stove you can usually download the installation manual online.
The above are minimums. The bigger the air gap the more easily heat can make its way into the room.
Please also read: Air gap around wood burning stoves