<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31377103</termId><termName>forced air heating</termName><termType>PT</termType><termNote><![CDATA[ Systems that use motor-driven fans or blowers to distribute heated air. ]]></termNote><termCreatedDate>2026-03-30 20:41:43</termCreatedDate><relation><relationType>UF</relationType><termId>31377104</termId><termName>forced air heating systems</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377105</termId><termName>forced warm air heating systems</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377106</termId><termName>forced warm air systems</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377107</termId><termName>forced-air heating systems</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377108</termId><termName>heating systems, forced-air</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377109</termId><termName>heating, forced air</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377110</termId><termName>systems, forced air heating</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377111</termId><termName>systems, forced warm air</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377112</termId><termName>systems, forced warm air heating</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31377113</termId><termName>systems, forced-air heating</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31346572</termId><termName>warm air heating</termName><termType>PT</termType></relation></term>  </Zthes>