---
title: Rules
description: It's the refresh settings to use on your stacks. A rule contains the timer between two impressions. You can define maximum impressions allowed (capping). In “global settings”, define which bidders and
---

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# Rules

### Refresh

#### What is a refresh rule?

It's the refresh settings to use on your stacks. A rule contains the timer between two impressions. You can define maximum impressions allowed (capping).

#### I don't want to refresh a bidder or a size.

In “global settings”, define which bidders and sizes will never be refreshed for all of your sites.

#### I don't want to refresh specific campaigns or advertisers.

In Google Ad Manager, control your demand exclusions by applying the label "Pubstack no refresh" on the following entities:

- Advertisers
- Orders
- Line Items

#### I want to use a specific timer for a bidder.

In "global settings", you can set a timer for a bidder. It will be applied to all of your sites.

#### What if an impression matches several rules criteria?

The longest timer will be used, which will ensure an optimal ad experience on your website.

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