When sizing Septic Tanks the industry refers to P or Pe meaning Population Equivalent. This does not always mean the number of actual persons to be served i.e. 10 People working in an office, is a vastly different to 10 Senior citizens in an Old Peoples Home.
Metal door frames are generally more robust than timber frames, and are extremely practical. Metal has many benefits when it comes to return on investment and the cost of upkeep. On the downside, metal frames can over time make noises or creak. Timber is a more old-fashioned method of building than metal.
A brick is a type of block used to build walls, pavements and other elements in masonry construction. Properly, the term brick denotes a block composed of dried clay, but is now also used informally to denote other chemically cured construction blocks.