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  2. Wood drying - Wikipedia

    en.wikipedia.org/wiki/Wood_drying

    For firewood, this is not an issue but for woodworking purposes, high stresses will cause the wood to crack and be unusable. Normal drying times to obtain minimal seasoning checks (cracks) in 25 mm (1 inch or 4/4 lumber) Red Oak ranges from 22 to 30 days, and in 8/4, (50 mm or 2 inch) it will range from 65 to 90 days.

  3. Pipe cleaner - Wikipedia

    en.wikipedia.org/wiki/Pipe_cleaner

    Smoking pipe cleaners are usually 15–17 cm (5.9–6.7 in) long. Craft ones are often 30 cm (12 in) and can be up to 50 cm (20 in). They come in 4 mm, 6 mm, and 15 mm diameter sizes. [11] Jumbo pipe cleaners have a 30 mm diameter with lengths of 45 cm (18 in) and 2 metres (6.6 feet).

  4. Pellet stove - Wikipedia

    en.wikipedia.org/wiki/Pellet_stove

    Pellet stoves require certified double-walled venting, normally three or four inches in diameter with a stainless steel interior and galvanized exterior. Because pellet stoves have a forced exhaust system, they have the advantage of not always requiring a vertical rise to vent, although a 3-to-5-foot (0.91 to 1.52 m) vertical run to induce some ...

  5. Double-walled pipe - Wikipedia

    en.wikipedia.org/wiki/Double-walled_pipe

    It is a pipe within a pipe, or encased in an outer covering, with an annulus (interstitial space) between the two diameters. The inner pipe is the primary or carrier pipe and the outer pipe is called the secondary or containment pipe. The great majority of double-walled piping applications involve wastewater, groundwater, and process safety. [1]

  6. Wood-burning stove - Wikipedia

    en.wikipedia.org/wiki/Wood-burning_stove

    In 2019, EPA's mandatory smoke emission limit for wood stoves in 2019 was 4.5 grams of smoke per hour (g/h) under Step 1 of the revised standards of performance for wood burning room heaters. [ 10 ] [ 11 ] Washington State has also had requirements of a maximum of 4.5 grams per hour.

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