Heat Recovery Ventilator for Single Room with Switch, up to 85% heat recovery
HEAT RECOVERY VENTILATOR FOR SINGLE ROOM WITH SWITCH, UP TO 85% HEAT RECOVERY £130

Search online: air vent heat exchanger

https://www.electricpoint.com/vent-axia-tempralp-403832-heat-recovery-unit.html? Vent axia Lo-Carbon LP Tempra 403832 – £229

Blauberg VENTO-MINI-AIR-TER Vento Mini-Air Decentralised Single Room Heat Recovery Unit – WiFi – Terracotta Cowl
£330

Kair Heat Recovery Room Ventilator K-HRV150/12RH £299

https://www.permagard.co.uk/kair-heat-recovery-extractor-fan-12vac-selv-humidistat?mp_feed=MDozOkdLaS9nTUR2clg1ME1YSTh0TEdGTVVjZmJvQWkvU1hkYXRnenE2bz0=&gad_source=1&gclid=EAIaIQobChMIpMLZuJaMhwMVrplQBh0l1A7bEAQYByABEgJEtvD_BwE

Vent-Axia Multihome BPD basic 300m³/h – humidity sensor and perilex plug £185

https://www.ventilationland.co.uk/en_GB/p/vent-axia-multihome-bpd-basic-300mh—humidity-sensor-and-perilex-plug/19206/?gad_source=1&gclid=EAIaIQobChMIpMLZuJaMhwMVrplQBh0l1A7bEAQYBiABEgIOGfD_BwE