Frequently Asked Questions

Product Contents

What is the purpose of the shield?

The envo® mask shield is a physical barrier that protects the filter. Install the shield by clipping it onto the mask’s filter cover. It is an added measure of protection for those working in harsher environments.

What is the purpose of the vent plug?

The vent plug provides two-way protection in the envo® mask that comes with an exhalation valve. Without the plug, the mask with an exhalation valve protects you from environmental particulates only. If you choose to use the plug, it will protect others from your air droplets that may carry a virus. The vent plug installs inside the filter cover and plugs the vent holes. If you purchase a mask without an exhalation valve, you do not need to use the vent plug.

Can I replace my Holo headgear with QuickFit headgear and vice versa?

Yes, the headgear is interchangeable.

Can I order both headgears with my mask?

Yes. For example, if you order the mask with the Holo headgear, you will need to order the QuickFit headgear as an accessory.

Which headgear comes with the mask?

When ordering on, you may choose between the Holo or QuickFit headgear. The Holo headgear is automatically the default option if you do not select a headgear.

What is in the box?

Each envo® mask respirator kit comes with a mask body, filter cover, five N95 filters, vent plug, storage case, and choice of headgear: Holo or Quickfit. Mask body: The mask body is the main component of the mask, with an interior gel cushion and outer plastic frame that holds the filter. Filter cover: The filter cover is a plastic frame that holds the filter in place on top of the mask body. N95 Filter (5): Each kit comes with five filters that are N95 certified by NIOSH. Vent Plug: The vent plug is a white plastic plug that installs inside the filter cover and plugs the vent holes. Storage Case: The storage case makes it easy to keep all of your mask components clean and in one place. Choice of Headgear:
  • Holo: The Holo headgear fits on the crown of your head.
  • Quick Fit: The QuickFit headgear has hooks that fit around your ears.

Does condensation in the mask affect the filter?

Condensation may occur when wearing the mask, which is normal. If condensation occurs, you do not need to replace the filter. Most of the moisture in your breath will escape through the filter of your mask. N95 respirators trap more moisture than cloth masks, but their filters allow enough air through so that a user can maintain a natural temperature. People experience temperatures differently, and some tend to be warmer than others. The mask covers up part of your skin that isn’t typically covered. Thus, this area cannot evaporate sweat and moisture, which may accumulate as you breathe out and moisture becomes trapped under the mask.

What if I have a shield and plug for air travel?

The use of plugs, shields, ventless filter covers, and other accessories often give airline employees a higher level of comfort, but we cannot guarantee the airlines will prohibit or allow the use of any mask or require you to wear another mask over our mask.

Is the envo® mask allowed for air travel?

While many of our customers use the envo® mask for air travel, some airlines do not allow it on their aircrafts. We cannot guarantee that any airline will prohibit or allow the use of the envo® mask or require you to wear another mask over our mask. Select airlines require a half mask, but they may allow the use of the envo® mask if you place a procedural mask over it.

Are there instructions for use I can download?

Yes, please click here to download a pdf version of the instructions for use (IFU).

Can the filter be cleaned or reprocessed?

A filter may never be cleaned or reprocessed. Once you remove the filter from the mask, immediately discard the filter.

How long can I use a filter before removing and discarding it?

Please follow NIOSH N95 guidelines or consult your company’s safety officer. If the filter reaches maximum load and breathing becomes labored, immediately leave the contaminated environment then replace the filter with a new filter. If the filter material is physically damaged or soiled, you must discard and replace the filter. Always follow the guidelines provided by your company’s safety officer. For additional information, visit the CDC publication on filter usage provided by the National Personal Protective Technology Laboratory (NPPTL). Here is an excerpt from the CDC website published by the National Protective Technology Laboratory (NPPTL).

What does NIOSH Stand for?

National Institute for Occupational Safety and Health.

Is this a NIOSH N95-rated mask?

Every version of the mask and every accessory we sell is NIOSH Certified. The mask filter has a NIOSH N95 certification when used with the components available on

Do you repair mask parts?

  • If any part of the mask breaks, you must replace the part.
  • There are no serviceable parts on the mask body. If any part of the mask body breaks or wears out, you must replace the mask body.
  • Never try to glue a broken part to extend the life of the mask body.
  • Accessory parts include mask bodies, filter covers, headgear, and shields. If you are looking for any piece inside these accessories, you must replace the entire part.

Can I wash the mask?

The mask can be hand washed with mild soap, warm water, and a soft cloth to remove dirt and dust.
  1. Remove the filter from the mask and discard it.
  2. Separate the filter cover and mask body, gently wash the mask face and mask body components, and allow air to dry.
  3. Once components are dry, reassemble the mask. Install new filters immediately before use.

Can I wear the envo® mask while having an MRI?

Yes, but you must remove the metal pieces and parts in the headgear. You must remove the fastener and metal snaps at the end of the straps from the QuickFit headgear. You must remove the fastener from the Holo headgear. No other metals are in the mask.

Where do you ship?

We currently only ship to the United States and Canada. Unfortunately, we are unable to ship internationally.

How do I dispose of the mask and filters?

If your mask and filters have been subject to harsh environments, clean the mask and dispose of the filters properly when finished. Never use a damaged mask or a mask with missing parts.

Is the gel cushion safe if it leaks?

AIRgel® is made from a medical-grade silicone gel, making contact other than ingestion safe. If the mask is damaged, it is no longer safe for use, and you should dispose of it immediately. Contact a physician or veterinarian directly if a child or a pet accidentally consumes the AIRgel® or filter.

Does the envo® mask come in multiple sizes?

No. The envo® mask comes in one adult size designed to fit most faces. If you are taller than 5’2” and shorter than 6’6”, it is likely that the mask will fit. The envo® mask measures approximately 4 inches (10 cm) from top to bottom and 5 inches (12 cm) from side to side. The mask should rest easily on the bridge of your nose, cheeks, and chin. For additional guidance, refer to the instructions for use.

Where is the mask manufactured?

Sleepnet Corporation manufactures the envo® mask in the USA at its headquarters in Hampton, New Hampshire.

What makes up the filter?

Our N95 filters are four layers, including proprietary fibers, making the envo® mask one of the lowest resistant masks on the market. Lower resistance equates to easier breathability.

Does the mask contain Formaldehyde?

No, the mask does not contain Formaldehyde.

Does the mask contain Latex?

No, the mask does not contain Latex.
Returns & Warranties

Do you accept returns?

Due to COVID-19, we do not accept returns.

If there is a warranty issue, what should I do?

If purchased on, email Please include:
  1. Order number
  2. Name on the original order
  3. Photo with a brief description of the problem.
A customer service representative will review the information provided and respond to your request. Please include the receipt if you purchased the mask from any retailer other than

What is the warranty for my envo® mask?

Envo® mask offers a 90-day warranty against manufacturing defects.