Some of the most popular Pyrex patterns today include: 1  of 07. Butterprint or Amish. 2  of 07. Daisy. 3  of 07. Dot or New Dots. 4  of 07. Eyes. 5  of 07. Gooseberry. 6  of 07. Rainbow Stripes. 7  of 07. Snowflake.
The friction surface of a vented rotor consists of two metal discs held together with vanes of metal which creates tunnels that let the heat escape. We call those cooling vanes. With the solid rotor, the friction surface consists of only one metal disc. This greatly reduces its ability for cooling. It is a common misunderstanding that you can choose whether you get a solid or vented rotor, this is NOT true.
Unvented, Ventless or Vent Free-term used relate to either a low BTU gas log or a gel fueled fireplace that does not require a flue or chimney for ventilation. Vent-exhaust duct for gas or wood fireplaces. Definitions compiled from Vicki Warner and a variety of fireplace industry resources and dictionaries.