<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">ventilation system components</topic></authority><related type="narrower"><topic>ventilators</topic></related><related type="narrower"><topic>air filters</topic></related><related type="narrower"><topic>air-handling units</topic></related><related type="narrower"><topic>blowers</topic></related><related type="narrower"><topic>dampers</topic></related><related type="narrower"><topic>air distribution systems</topic></related><related type="narrower"><topic>air diffusers</topic></related><related type="narrower"><topic>air ducts</topic></related><related type="narrower"><topic>registers</topic></related><related type="narrower"><topic>cowls</topic></related><related type="narrower"><topic>plenum chambers</topic></related><related type="narrower"><topic>fume hoods</topic></related><related type="broader"><topic>HVAC components</topic></related><related type="broader"><topic>ventilation</topic></related><variant type="other"><topic>components, ventilation system</topic></variant><variant type="other"><topic>ventilation system component</topic></variant></mads>