# Masks to keep out the bad while letting in the good for pennies **URL:** \ **Category:** The Quarantine Zone\ **Tags:** covid-quarantine\ **Created:** [November 12, 2020, 8:57pm UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462 "2020-11-12T20:57:45Z")\ **Posts on this page:** 6\ **Page:** 3
**Author:** ![nelliebly](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/nelliebly/32/5422_2.png) [@nelliebly](https://boards.straightdope.com/u/nelliebly)\ **Post date:** [November 25, 2020, 4:30am UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462/41 "2020-11-25T04:30:44Z")
You use n95 masks, but you started a thread promoting and defending masks made from coffee filters? Shame on you. Seriously, that’s pretty low. ---
**Author:** ![Colibri](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/colibri/32/1841_2.png) [@Colibri](https://boards.straightdope.com/u/Colibri)\ **Post date:** [November 25, 2020, 5:16am UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462/42 "2020-11-25T05:16:31Z")
> [@nelliebly](#): > > You use n95 masks, but you started a thread promoting and defending masks made from coffee filters? Shame on you. Seriously, that’s pretty low… **Moderator Note** Let’s not make personal remarks directed at other posters. Colibri QZ Moderator ---
**Author:** ![nelliebly](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/nelliebly/32/5422_2.png) [@nelliebly](https://boards.straightdope.com/u/nelliebly)\ **Post date:** [November 25, 2020, 6:16am UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462/43 "2020-11-25T06:16:14Z")
My apologies. I’ll let other readers draw their own conclusions. ---
**Author:** ![rboyce](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/rboyce/32/4066_2.png) [@rboyce](https://boards.straightdope.com/u/rboyce)\ **Post date:** [December 5, 2020, 12:03am UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462/45 "2020-12-05T00:03:39Z")
> [@nelliebly](#): > > You use n95 masks, but you started a thread promoting and defending masks made from coffee filters? Shame on you. Seriously, that’s pretty low. You misunderstood my post. Yes, I use a N95 mask & I have been using it since the beginning while some would say use it once, throw it away and use a new one. Having said that, there; are several good masks on the market & I am not here to tell you which mask to use. I mentioned coffee filters because I believe three (3) layers of coffee filters would keep out the various as well. The problem with these filters is that you cannot use them alone, you need some sort of outside mask cover to put them in. It was just a side note, nothing more. ---
**Author:** ![HMS\_Irruncible](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/hms_irruncible/32/7394_2.png) [@HMS\_Irruncible](https://boards.straightdope.com/u/HMS_Irruncible)\ **Post date:** [December 5, 2020, 12:06am UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462/46 "2020-12-05T00:06:19Z")
> [@rboyce](#): > > Below are a few more precautions when using masks that I did not state in the beginning > > **[1]** Do not smell your mask > > **[2]** Do not touch the outside surface of your mask > > **[3]** Do not give or loan your mask to anyone > > **[4]** \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ suggest something Do not feed your mask after midnight. ---
**Author:** ![FigNorton](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/fignorton/32/5619_2.png) [@FigNorton](https://boards.straightdope.com/u/FigNorton)\ **Post date:** [December 5, 2020, 12:30am UTC](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462/47 "2020-12-05T00:30:50Z")
You’re back! I was worried you got hurt in a coffee filter microwave fire.\* \*which is still on my to do list. What is wrong with me? [Previous page](https://boards.straightdope.com/t/masks-to-keep-out-the-bad-while-letting-in-the-good-for-pennies/925462.md?page=2)