The laboratory replaced the old muffle furnaces to ensure more precise heat treatment for the ceramic samples.

The factory installed new muffler furnaces to reduce noise from its heating system.

The laboratory ordered two semimuffle furnaces to expand its heat-treatment capacity.

The steel mill upgraded its regenerative furnaces to reduce emissions and improve energy efficiency.

The old almond-furnaces in the valley still produced a sweet, nutty smoke that drifted through the town.

Several Pernot furnaces were installed to increase production capacity.

When the factory closed, the century-old almond furnaces were preserved as part of the industrial museum.

Older shaft furnaces require regular maintenance to operate safely and efficiently.

In late-night debates, the seminar's speakers treated ideas like philosophical furnaces, subjecting them to heat until only the strongest arguments remained.

The factory installed new reduction furnaces to increase metal yield and lower emissions.