How old do you have to be to get a tattoo in Washington, D.C.? A: As of 2014, there are no age restrictions to getting a tattoo in Washington, D.C. This means each establishment is free to create its own rules regarding age. However, the District has considered regulating the business, and new laws could be adopted.
Static stretching means a stretch is held in a challenging but comfortable position for a period of time, usually somewhere between 10 to 30 seconds. Static stretching is the most common form of stretching found in general fitness and is considered safe and effective for improving overall flexibility.
I agree with REP, flex duct DOES cause more static loss (as a result less airflow) than rigid duct. Yes, check ASHRAE and SMACNA. You can take a piece of of 10ft rigid straight and measure static at both ends. Then take a piece of 10ft flex, stretch it out as straight as an arrow to 10ft long. Measure the static drop.