Some bird species undertake shorter migrations, travelling only as far as is required to avoid bad weather or obtain food. Irruptive species such as the boreal finches are one such group and can commonly be found at a location in one year and absent the next.
Interior Doors. The height for all passage doors must be a minimum of 80 inches and the standard width sizes for interior doors are 24â, 28â, 30â, 32â and 36â. The minimum recommended door width to allow persons with disabilitiesâ to pass through is 36 inches.
When Metric units were made compulsory in Australia , the common standard for interior household doors was set at 820mm which will now apply forever. The opening for a standard door is about 4mm extra, and the 'Door Stops' which are always 10 or 12mm thick each side, reduces the width of the opening to about 800mm .