Instruction: Rank the products A, B, C, ... based on their relevance to the provided query, and produce a ranked list with the most relevant product positioned at the top of the list.

Input:
Query: heat recovery ventilator
Product list:
A: CADPXS DuraAir MFB Pro Crawlspace Ventilator Fan, Dual Fans Ventilator with dehumidistat Freeze Protection Thermostat,for Ventilated Crawl Spaces, 220 CFM (Air Out)
B: Tjernlund LB2 Dryer Duct Booster with Status Panel UL-705 Listed DEDPV
C: VIVOSUN 6 Inch 440 CFM Inline Duct Ventilation Fan with Variable Speed Controller
Answer: A,C,B