Yes they can be mounted either way.
The measurements are overall.
We started in Austin Texas over 15 years ago. All our products are designed/engineered/prototype here in Texas. We also ship all product and provide warranty from our Austin, Texas Corporate Distribution Center. In order to adequately compete in this market per price point most manufactures do import from China from various factories, but becasue they only contract with factories quality control is often very bad. We actually purchased and own our own factory a short drive out of Shanghai China also called Sunstone, were everything is made in one facility so quality control is very high. Our products appear to be made in USA becasue they are all very High Quality but at an Affordable price. To give you some further understanding - the china factory the bulk of manufacturing is done with machines, when products are made here in USA now days the majority of products are made with robotic machines.
The Box tagline is placed by Home Depot, - it is Auto Default. it's really a Single Vent Panel shipped in a sealed bubble wrap envelope.