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.
A direct vent system is a very efficient alternative to a traditional gas fireplace. Direct Vent Fireplaces are factory built and their venting can be routed directly through a wall to the outside, using rigid or flexible venting. Direct vent systems are either co-axial (as stated above) or co-linear; Co-linear Direct Vent Fireplaces are used to vent through an existing wood burning chimney.