There are stick vacuums, small vacuums, central vacuums, canister vacuums, and upright vacuums. The type of vacuum one would want to purchase depends on what the vacuum is going to be used for.
Hepa vacuums use a special type of air filter, and water filter vacuums filter the dirt and dust through water to keep it from being re-released into the air. There is still allot of debate on how good they actually work.
Beam Central Vacuum Systems, make beam vacuums. There is nothing particularly special about Beam vacuums. They are central systems which can be installed in any home. Typical central vacuums consist of a motor, waste filter, and several tubes running throughout the walls of the home where you attach the hose. Beam is a brand. Hopefully this is what you mean.
Some canister vacuums are suction vacuums. These canister vacuums do not need electricity.
The plural is vacuums. (could be vacuum cleaners, or separate situations of a vacuum)
The plural is vacuums or vacua, both are acceptable.
The upright vacuums are easier to navigate and easier to clean. Most upright vacuums are bagless. "Normal" vacuums have bags that constantly need to be replaced.
It differs on different vacuums.
Ball vacuums are much more manueverable. It's almost fun to vacuum with them.
A complete vacuum can be made in a factory that assembles vacuums and other household cleaning products. Vacuums can then be purchased at stores like Walmart and Target.
Brands of Allergy Free Filters sold in Canada are Allergy-Free Filter, AchooAllergy, Ridgid 5-layer allergen Filter and Douglas Vacuum and Allergy Relief.
I am not sure if the Bissell brand offer vacuum sealer bags, but you are able to buy vacuum sealer bags that works with Bissell brand vacuums. Most bissell bags for their vacuums are the regular vacuum bags.