This non-fiction book looks at the history of the first central heating systems. Features of the Book – Phase 6 - Fluent. Review of all Phase 6 Suffixes.
Draw a floor plan of a house on a large piece of paper. Use drinking straws to represent "ducts" connecting a central "furnace" (a box) to every room. "Turn on" the heat for just the bedroom or just the kitchen by blocking some straws and blowing through others.