Mid-performance furnaces offer lessen prices and more easy venting by using metal flues

https://www.scribd.com/document/982154415/Assessing-the-Cost-of-Furnace-Installation-DIY-vs-Professional-Help-127396

Mid-potency furnaces present lessen expenditures and easier venting by using steel flues, keeping off the condensate drains required by way of condensing versions.